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Installation Instructions 1991+ GM 4L80E Transpak Kit Part Number 70376 ©2012 B&M Racing and Performance Products 9500865-00 Printed in the U.S.A. Gasket, Case to Spacer Plate Gasket, Valve Body to Spacer Plate Gasket, Accumulator Housing Drill (5/64, 3/32, #32) 3/8” X 5/16” ID (red) Spacer 1/2”L x 51/4” ID (orange) Spacer 1/2”L x 5/16”ID (green) Spacer 3/8”L x 1/4”ID (white) Spacer Press Control Solenoid Filter Press Regulator (red) & 3rd Accumulator (blue) springs TCC Solenoid Filter Shifter Solenoid Filter Oil Filter with Seal Press Regulator Retaining Ring Thank you for choosing B&M, The per- formance company with over 50 years experience designing and manufac- turing quality high performance auto- motive driveline components. Before proceeding with the installa- tion please read all of the B&M 4L80E Transpak Kit installation instructions so you will be familiar with the series of steps required to install this kit. For other service information on your 4L80E transmission consult the ap- propriate factory service manual for your vehicle. Important Note: Since mid 1992 pro- duction the 4L80E has been as- sembled with a heavy duty reusable oil pan gasket. If your pan gasket is damaged or you have a 1991 or early ‘92 transmission, you will have to pur- chase a replacement oil pan gasket at your parts supplier. An Oil Pan Gas- ket IS NOT supplied with this kit. The B&M 4L80E Transpak Kit me- chanically recalibrates your transmis- sion to produce firm positive shifts, this helps reduce clutch pack heat build up and improves transmission durability. This kit does not change or modify shift point RPM in any range. All transmis- sion shift point RPM and pressure con- trol functions remain under full PCM (Powertrain Control Module) control as they were originally. No recalibration kit can fix an already ailing transmission. If your 4L80E is slipping, overheating, shifting irregularly or making noise, you should have it repaired before or, in conjunction with the installation of your B&M 4L80E Shift Improver Kit. GENERAL 4L80E INFORMATION B&M’s 4L80E Transpak Kit was de- signed to provide firm positive shift quality and improve transmission du- rability in original vehicle installations, especially those with moderate engine power improvements. This kit was not designed for and is not suitable for all out racing applications. Your 4L80E Transmission is controlled by the PCM which has full control of the 4L80E’s operation. All of the pa- rameters that control fluid pressures, shift point RPM and TCC (Torque Con- verter Clutch) Iockup speed have been preprogramed into the PCM at the Parts in Kit Boost Valve Kit

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Page 1: Installation Instructions - CatalogRack · 1 Installation Instructions 1991+ GM 4L80E Transpak Kit Part Number 70376 ©2012 B&M Racing and Performance Products Printed in the U.S.A

1

Installation Instructions1991+ GM 4L80E Transpak Kit

Part Number 70376©2012 B&M Racing and Performance Products

9500865-00Printed in the U.S.A.

Gasket, Case toSpacer Plate

Gasket, Valve Body toSpacer Plate

Gasket, AccumulatorHousing Drill (5/64, 3/32, #32)

3/8” X 5/16” ID (red)Spacer

1/2”L x 51/4” ID(orange) Spacer

1/2”L x 5/16”ID (green)Spacer

3/8”L x 1/4”ID (white)Spacer

Press ControlSolenoid Filter

Press Regulator(red) & 3rd

Accumulator (blue)springs

TCCSolenoid Filter

ShifterSolenoid Filter

Oil Filter withSeal

Press RegulatorRetaining Ring

Thank you for choosing B&M, The per-formance company with over 50 yearsexperience designing and manufac-turing quality high performance auto-motive driveline components.Before proceeding with the installa-tion please read all of the B&M 4L80ETranspak Kit installation instructionsso you will be familiar with the seriesof steps required to install this kit. Forother service information on your4L80E transmission consult the ap-propriate factory service manual foryour vehicle.Important Note: Since mid 1992 pro-duction the 4L80E has been as-sembled with a heavy duty reusableoil pan gasket. If your pan gasket isdamaged or you have a 1991 or early

‘92 transmission, you will have to pur-chase a replacement oil pan gasket atyour parts supplier. An Oil Pan Gas-ket IS NOT supplied with this kit.The B&M 4L80E Transpak Kit me-chanically recalibrates your transmis-sion to produce firm positive shifts, thishelps reduce clutch pack heat build upand improves transmission durability.This kit does not change or modify shiftpoint RPM in any range. All transmis-sion shift point RPM and pressure con-trol functions remain under full PCM(Powertrain Control Module) control asthey were originally.No recalibration kit can fix an alreadyailing transmission. If your 4L80E isslipping, overheating, shifting irregularlyor making noise, you should have it

repaired before or, in conjunction withthe installation of your B&M 4L80EShift Improver Kit.

GENERAL 4L80E INFORMATIONB&M’s 4L80E Transpak Kit was de-signed to provide firm positive shiftquality and improve transmission du-rability in original vehicle installations,especially those with moderate enginepower improvements. This kit was notdesigned for and is not suitable for allout racing applications.Your 4L80E Transmission is controlledby the PCM which has full control ofthe 4L80E’s operation. All of the pa-rameters that control fluid pressures,shift point RPM and TCC (Torque Con-verter Clutch) Iockup speed have beenpreprogramed into the PCM at the

Parts in Kit

Boost Valve Kit

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recommend B&M Trick Shift ATF.

SPECIAL INSTRUCTIONSChoose a clean, dirt and dust freeplace to work on your 4L80E. Dirt,loose threads from rags and pieces ofold gaskets can become lodged invalve bores and/or separator plate ori-fices and cause the transmission tomalfunction. If you do not have a sol-vent cleaning setup available, get sev-eral cans of WD40® to clean yourparts.

Warning: Almost all cleaning solventspose a threat of fumes and or fire.Make sure to use cleaning solventsonly in a well ventilated location awayfrom any source of ignition such asopen flames, sparks, hot water heat-ers, etc.

Required ToolsFine CutFlat File Flat Screwdriver Funnel Gasket Scraper Hammer

Indelible MarkingPen

Small Retaining RingPliers Torque Wrench Petroleum Jelly

Needle NosePliers

Ratchet WrenchExtension2” & 8” 3/8” Drill T27 Torx Driver

Wrench8mm & 10mm

Socket8mm & 10mm

factory. We have designed this kit asan easy way to overcome the less de-sirable features of the factory cali-brated imperceptible shifts. With thiskit you can set the shifting character-istics of your 4L80E to one of two lev-els of performance, Heavy Duty orHigh Performance Street.

- Heavy Duty level produces a solid,noticeably firm shift when comparedto the stock shift feel. - High Performance Street level pro-duces a slightly quicker and more ag-gressive shift compared to Heavy Dutylevel.

After installing the B&M Transpak Kitthe actual shift feel you get will de-pend on the factory PCM calibration,AutomaticTransmission Fluid (ATF)temperature and the type of ATF you

have used. As ATF temperature in-creases it becomes thinner (less vis-cous) which allows the fluid to flowfaster through small orifices therebyproducing faster shift rates. In additionto the effects of temperature, eachtype of ATF (B&M Trick Shift ,Dexron ® III, Type F, etc.) has a spe-cific characteristic friction property.This characteristic friction property isone of the variables that determinesshift feel and clutch torque capacity.Dexron® type ATF’s were formulatedto produce smooth imperceptibleshifts, while Type F or B&M TrickShift ATF with their higher frictionproperties results in firmer shift qual-ity than Dexron ® lll type ATF. BothDEXRON ® III and B&M Trick Shift ATF’s are suitable for use in your4L80E transmission. For maximumperformance and positive shift feel we

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Be careful with the internal and exter-nal wiring harness. Wiring and/or con-nectors are easily damaged and diffi-cult to troubleshoot if they are dam-aged.

VERY IMPORTANTUse petroleum jelly to hold checkballsand gaskets in place during installa-tion. DO NOT use any kind of wheelbearing grease to hold checkballs inplace, these greases do not melt ormix readily with ATF and can block shiftand pressure control solenoid feed cir-cuit filters and orifices, causing erraticshifts and potentially serious transmis-sion damage because of low line pres-sure.

CAUTIONS ABOUT PCM.The MIL (Malfunction Indicator Light orCheck Engine Light) may be illumi-nated (turned ON) if the vehicle isstarted and any of the transmissionelectrical connectors are disconnectedor has wires that are broken, or havebeen pinched and/or shorted. The MILis programmed to illuminate whenevera system (engine or transmission)component malfunctions and at thesame time a DTC (Diagnostic TroubleCode) is set in the PCM. You may haveto refer to your owners manual, a GMservice manual or visit a GM dealer todetermine the source of themalfunction(s) that cause(d) any DTCcodes to be set and the required rem-edy. Make sure your engine is in goodtune and any problems related to settrouble codes are repaired BEFOREattempting to install your B&MTranspak Kit.Do Not attempt to jumper the Data Linkconnector to read a DTC from the PCMin your vehicle until you have checkedyour owners manual, GM servicemanual, or verified with your GM dealerthat the particular PCM in your vehicleallows jumpering the data link.Jumpering the data link connector toread DTC’s is not possible on any 1996or later OBD II vehicle and can dam-age the PCM and result in a very ex-pensive repair bill. Except for some1991 to 1995 PCM’s, all others will re-quire the use of a diagnostic scannerto read. Some DTC codes are “hardcodes” and may require a diagnosticscanner to turn them off after the mal-function which set the DTC has beenrepaired.If electrical power to the transmissionis cut or the PCM fails the 4L80E will

operate in “limp home” mode. If thishappens, you will only have Reverseand Drive 2 range available.

Before installing your Shift Improver Kitthere are several other B&M productsyou may wish to consider and areavailable at your B&M dealer:

- TRICK SHIFT PERFORMANCEATF: The industry’s only real perfor-mance ATF. A specially blended oilformulated with foam inhibitors, ex-treme pressure agents and shift im-provers, this fluid assures protectionwhile delivering the fastest possibleshifts. You literally “Pour in perfor-mance”.

- TRANSMISSION OIL COOLER:We feel that it is very important thatevery vehicle used in heavy duty or highperformance application should havean auxiliary oil cooler. Excessive heatis the primary cause of transmissionfailures, and an auxiliary oil cooler isan inexpensive safeguard against over-heating and failure. B&M offers a widerange of transmission coolers to suitevery need.

- DRAIN PLUG KIT (P/N: 80250):1991 and early 1992 model 4L80Etransmission oil pans do not come fromthe factory equipped with drain plugs.The B&M Drain plug kit is inexpensiveand easy to install. It eliminates themess when changing fluid or on panremoval.

- TEMPERATURE GAUGE KIT (P/N:80212): Most transmission and con-verter failures can be traced directlyto excessive heat. The B&M transmis-sion temperature gauge can save youa costly repair bill by warning you ofan overheated transmission. The B&Mtemperature gauge comes with all nec-essary hardware and is easy to install.

PREPARATION FOR KITINSTALLATION

Automatic transmissions operate attemperatures in the range of 150° and250° Fahrenheit. We recommend thevehicle be allowed to cool for severalhours before disassembly to avoidburns from hot oil and parts. The ve-hicle should be raised so there is atleast 2 feet ground clearance for easeof installation and safety.MAKE SURE THE VEHICLE IS RIG-IDLY AND SECURELY SUPPORTED,

JACK STANDS, WHEEL RAMPS ORA HOIST WORK BEST, DO NOT USEJACKS ALONE.Have an oil drain pan ready to catchoil and a tray on which to put smallparts so they won’t get lost.It can never be said enough: Make sureyou have a clean, dust free place towork. Burrs and dirt are the numberone enemies of an automatic trans-mission. Contamination in the valvebody or pressure regulator valve traincan result in serious transmission dam-age and un-predictable operation.Transmission components are preci-sion fit. Work slowly and do not forceany parts.This kit contains all parts necessaryto obtain two different shift feel levelsof performance depending on the in-tended use:1. Heavy Duty level: Towing, camp-ers and, 4-wheel drive vehicles. Shiftfeel is firm and positive.2. High Performance Street level:Dual purpose performance vehicles.High Performance Street level pro-duces the firmest shift feel.

DISASSEMBLYSTEP 1. Position your drain pan un-der the transmission to catch theATF.Remove oil pan by first removingrear pan bolts, then work towards thefront. Loosen but do not remove thethree front bolts. If the pan sticks tothe gasket, insert a flat screwdriver be-tween the pan and case and pry downgently to break pan loose. Now slowlyback out the front three bolts to per-mit draining the ATF. Remove pan gas-ket and inspect for damage. The OilPan Gasket is reusable (if not dam-aged) except on 1991 and early ‘92transmissions. An Oil Pan GasketIS NOT included with this kit. If yourgasket is damaged, ypu will have topurchase one at your parts supplier.STEP 2. Remove the oil filter fromcase by gripping it firmly and pulling itstraight out away from the case. In-spect the filter pickup tube seal thatis pressed into the pump housing (SeeFig. 1). If the seal and filter appear tobe in good condition they may be re-used, otherwise both the seal and fil-ter should be replaced.STEP 3. There are several different wir-ing harness configurations used on the4L80E. Before proceeding further,make a sketch and some notes de-scribing your particular unit, recording

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PressureRegulator

Bore

Oil Filter PickupTube Seal

Detent Spring

Pressure SwitchAssembly

Detent Lever Pin Manual Valve

Dip StickStop

Lube Pipe

Early model units usedo-rings in the pressureswitch assembly. Makesure to recover themduring disassembly.

When installing the valvebody make sure ALL ofthe screws have beeninstalled in the valve body(finger tight) BEFOREbeginning to tighten andtorque the bolts.

Your Valve Body installation may appear slightly different than this one.Reinstall the components as they were originally on your unit.

Accumulator Housing Bolts:

1991 - 1993(1) M6 x 100mm x 8mm Hex(5) M6 x 65mm x 8mm Hex

1994 - 1996(6) M6 x 65mm x 8mm Hex

BC = Model (will vary)P = 4L80E Transmission

Model YearCalendar Year

Julian Date

Valve Body Bolts:

(6) M6 x 55mm x 8mm Hex(1) M6 x 35mm x 10mm Hex(21) M6 x 55mm x 10mm Hex

Figure 1: Valve Body & Trans I.D.

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which connectors go to which solenoid(See Fig. 1). Pay particular attentionto the location of the cable clamps anddipstick stop bracket. Notice how theconnectors and wires are colored.Remove connectors from pressureswitch assembly and solenoids thentie the wires up out of the way.STEP 4. Remove all except the cen-ter valve body bolt. Pull the lube pipeout of the case, pulling it out first atthe front then at the rear. When re-moving the pressure switch, be sureto recover all 5 switch assembly O-ring seals as it is removed. Hold thevalve body firmly with one hand andremove the remaining bolt slowly. No-tice how the Manual Valve is engagedto the detent lever as you remove thevalve body from case. Caution: Thereare eight (8) check balls in the caseabove the valve body along with sev-eral pints of oil (export units and someearly models have nine (9) checkballs). Have your drain pan ready tocatch the oil and check balls. Save allthe check balls in a secure place wherethey won’t get lost.STEP 5. Remove the 6 screws hold-ing the accumulator housing to thevalve body (See Fig. 7). Be careful tokeep the 2 or 3 accumulator springslocated inside the housing aligned withtheir respective bores.STEP 6. Remove all of the old gasketmaterial stuck to the Case flange, OilPan, Vavle Body, Spacer Plate and Ac-cumulator Housing.

MODIFICATIONS

Pressure RegulatorSTEP 7. Heavy Duty and High Per-formance Street levels:Remove the snap ring at the end ofthe pressure regulator bore (See Fig.2). Use a screwdriver to push againstthe spring loaded Boost Valve sleevewhile removing the retaining ring. Re-move Boost Valve Sleeve and Valve,Pressure Regulator Spring and thePressure Regulator Valve. Reassemblethe pressure regulator assembly in re-verse order using the supplied REDPressure Regulator Spring, BoostValve, Boost Sleeve and RetainingRing. Important: Early model 4L80E(1991-early 1992) require the BoostValve and OEM pressure regulatorvalve to be modified. Follow SonnaxInstructions that are provided to makethe required modifications.Do not in-termix early and late Pressure Regu-

lator Valves, Booster Valve or Sleeve.The provided Balance Oil Plug shouldonly be installed when the transmis-sion is out of the vehicle because thepump assembly needs to be out of theunit. It is installed on the backside ofthe Pressure Regulator Valve, refer tothe Sonnax instructions provided. Makesure the retaining ring is fully seatedin its groove when assembled. If theretaining ring is not fully seated in itsgroove, the pressure regulator assem-bly will blow out of its bore when theengine is started, resulting in NO LINEpressure.

Spacer PlateSTEP 8. Heavy Duty and High Per-formance Street levels:Drill the orifices as indicated (See Fig-ure 3) with the supplied drill bits. Becareful to use the specified size drilland only drill the holes indicated forthe Perfomance Level you have cho-sen. For best results first use an in-delible pen to mark the holes to bedrilled on the spacer plate, and thendouble check your marks against Fig-ure 3. Drill the smaller hole sizes first.If you incorrectly drill your spacerplate, you can obtain one from yourGM Parts Department, B&M does notstock 4L80E Spacer Plates. Be sureto take the build Year and Model infor-mation (See Fig.1) located on the tagon the right hand side of the transmis-sion when ordering parts for your4L80E.

ReassemblySTEP 9. Replace the Pressure Con-trol Solenoid (PCS) Filter and Shift So-lenoid Feed (SSF) Filter (See Fig. 4).in the Valve Body with the new filterssupplied in the kit. Coat the O-ringson the filters with clean ATF prior toinstallation. The PCS Filter is removedby pulling it straight up out of the Valvebody. Remove the SSF filter by firstremoving the Filter Bore Plug Retain-ing Pin and then the Manual Valve fromits bore. Very carefully insert an 8”long 3/8” drive extension into theManual Valve bore and gently push theSSF filter out of its bore. Reassembleboth filters in reverse order of disas-sembly. Remove the TCC SolenoidScreen from the case (See Fig. 8) andreplace it with the new filter from kit.STEP 10. Apply a few dabs of Petro-leum Jelly to both sides of the CLEANdrilled and deburred Spacer Plate thenstick the Spacer Plate Gaskets (See

Fig. 5) onto the appropriate sides ofthe plate and line up the holes. Placethe Spacer Plate on the Valve Bodyand insert several Valve Body Screwsto help line up with the holes.

AccumulatorsSTEP 11. Heavy Duty Level Only:Remove the 4th Accumulator pistonfrom its bore (See Fig. 6). Install the3/8” long WHITE or RED spacer overthe piston pin and reinstall the piston.STEP 12. High performance StreetLevel Only: Remove the 4th Accumu-lator piston from its bore (See Fig. 6).Install the 1/2” long ORANGE orGREEN spacer over the piston pin and

Figure 2: Pressure Regulator

PressureRegulator

Bore

REDP/R

SPRING

NewRetaining

RingReassemble the Pressure

Regulator in this order

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reinstall the piston.STEP 13. Heavy Duty and High Per-formance Street levels: Replace thestock 3rd Accumulator Spring with theBLUE 3rd Accumulator Spring includedin the kit (See Fig.6).STEP 14. Stick the Accumulator gas-ket in place on the spacer plate withpetroleum jelly. Place the accumula-tor springs and housing onto valve body.Install six (6) M6 x 65mm (Late model)of five (5) M6 x 65mm and one (1) M9x 100mm (early model) bolts and turnthem down evenly. Make sure all ofthe Spacer Plate and Gasket holes arelined up with the Valve Body holes then

torque the Accumulator Housing boltsto 11 Nm(8 lb ft).STEP 15. Check Balls: If the trans-mission is in the vehicle it is easiestto place the Check Balls (See Fig. 7)in the appropriate positions on theSpacer Plate and then install the ValveBody. If the transmission is on thebench then placing the Check Balls inthe case cavities (See Fig. 8) is thecorrect placement method. Use a dabof Petroleum Jelly to hold the CheckBalls in place. Most transmissionswill have eight (8) Check Balls al-though, export models and some earlymodels have nine (9). Only eight (8)

Check Ball positions are used withthis kit regardless if you originallhad nine (9) Check Balls or eight(8).STEP 16. Make sure the Front Servo(See Fig. 8) is correctly installed if itwas removed or fell out of its bore whilethe Valve Body was removed. Wipingthe bore dry and then coating the pis-ton with petroleum jelly will usually helpto hold the Servo Piston up in the caseduring Valve Body installation.STEP 17. Make sure the Spacer Plategaskets are properly positioned and theCheck Balls are in place. Carefully as-semble the Valve Body to Case while

HD=Heavy Duty Level HPS=High Performance Street LevelThere were 3 Spacer Plate designs used in the 4L80E from 1991 to 1996. The outline and some features onyour Spacer Plate may appear slightly different when compared to the illustration. The drilled orifice locationshowever are the same for all 1991 through 1996 versions.Using an indelible pen, first mark the orifices to be drilled on your spacer plate and then double check themarked locations against the above illustration. Drill the smaller orifice sizes first. Drilling the orifices largerthan specified will result in unpredictable shift characteristics and possible transmission damage.

HD & HPS.078 (5/64”)

HD .094 (3/32”)HPS .116 (#32)

HD .078 (5/64”)HPS .094 (3/32”)

HD .094 (3/32”)HPS .094 (3/32”)

HD & HPS.094 (3/32”)

HD .078 (5/64”)HPS .094 (3/32”)

HD & HPS.116 (#32)

Figure 3. Spacer Plate Modification

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Valve Body To Spacer Plate Gasket

VB

Accumulator Housing Gasket

Spacer Plate To Case Gasket

TC

Figure 5: Spacer Plate Gaskets

PCS Filter

You may have toloosen screw androtate the ShiftSolenoid to removethe SSF Filter

SSF Filter

Filter Bore Plug

Plug Retaining Pin

Figure 4: PCS and SSF Filters

1991-1993AccumulatorHousing

1994 & UPAccumulatorHousing

4th Accumulator SpacerHD 3/8” WHITEHPS 1/2” ORANGE

4th Accumulator SpacerHD 3/8” REDHPS 1/2” GREEN

Figure 6. Accumulator Assembly

3rd AccumulatorPiston

3rd AccumulatorPiston

TS CompensatorSpring

TS CompensatorPiston 4th Accumulator

Spring & Piston

BLUE 3rdAccumulatorSpring

4th AccumulatorSpring & Piston

BLUE 3rdAccumulatorSpring

guiding the Detent Lever Pin into theManual Valve groove. Push the ValveBody firmly against the Case and installone (1) screw, finger tight, in the centerof the Valve Body to hold it in place. In-stall the Pressure Switch Assembly withsix (6) M6 x 55mm x 8mm Hex headscrews. Install the Lube Tube, remain-ing clips and Dip Stick Stop. When all ofthe screws have been installed, torquethem to 11 Nm (8 lb ft) starting in thecenter and working circularly outward.Attach wire loom electrical connec-tors.

STEP 18. Install the new oil filter withseal provided in kit (See Fig. 1) intothe case.

STEP 19. DOUBLE CHECK THE FOL-LOWING:

1. Manual Valve Body is properly en-gaged with pin on detent lever.2. All bolts are installed and torqued.3. Wiring harness connectors are en-gaged to switch assembly and sole-noids.4. Pressure Regulator Retaining Ringis fully seated in its groove.

STEP 20. Coat the Oil Filter pickuptube with clean ATF then push the tubeinto the filter seal in the case. Installthe Oil Pan and Gasket then torquethe seventeen (17) bolts to 24 Nm (18lb ft). Fill transmission with ATF tothe full mark on dip stick. You willneed about 6 to 7 quarts. Dexron®III

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1991-1993 AccumulatorHousing shown Use petroleum jelly to hold the

Check Balls in place.DO NOT use grease.

Install Check BallsEITHER on Spacer plateOR in the Case locationswhichever is easier # 1

# 8

# 10

# 6 # 5 # 9

# 4

# 3

# 2 This Check Ballposition is not used

Figure 7. Check Ball Placement on Spacer Plate.

# 2 This CheckBall position isnot used

# 6 # 5

# 10

# 8

# 3# 4

# 9

# 1

TCC Filter shownpulled out of its bore

Front Servo Pistonand Spring shownremoved from bore

Figure 8. TCC Filter and Case Check Ball Locations.

is fine for Heavy Duty Level applica-tions however, we recommend B&MTrick Shift ATF for High PerformanceStreet level applications.With the vehicle still off the ground,start the enging and shift the trans-mission through all gears. Check forleaks around oil pan flange and drainplug. Place selector in neutral andcheck the fluid level. Turn engine offand then lower vehicle.STEP 21. Test drive vehicle and re-check for leaks while transmission ishot. Check fluid level again, adjustinglevel as required.

TM

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ERROR CONDITION WHERE TO LOOK FOR CAUSE

High or Low Oil Pressure Oil Pump - Pressure Regulator Valve Stuck.- P/R Retainnig Ring not fully seated in groove.

Oil Filter - Cracks in Filter Pickup Tube.- Pickup Tube Seal Damaged.- Wrong grease used on reassembly (clogged solenoid filter).

Wire loom - Electrical connectors not fully engaged.Valve Body Assembly - Spacer Plate or Gaskets misassembled or damaged.

- Check Balls omitted or misassembled.- Valve Body or Accumulator Housing bolts loose.

Pressure Control Solenoid - Stuck “ON”Harsh/Soft Shifts Valve Body Assembly - Wrong holes drilled is Spacer Plate.

- Spacer Plate or gaskets misassembled or damaged.- Check Balls omitted or misassembled.

Oil Pump - Pressure Regulator Valve Stuck.Accumulator Assembly - Wrong Spring or Spacer installed.

- Damaged or missing Accumulator Housing gasket.- Accumulator Housing bolts loose.

Inconsistent or No Shifts Valve Body Assembly - Spacer Plate or gaskets misassembled or damaged.- Pressure Switch Assembly connector not fully engaged.- Pressure Swith Assembly/Valve Body bolts loose.

External Linkage - Manual Shift Lever Linkage misadjusted.Wire loom - Electrical connectors not fully engaged.

No or Slips in 1st Gear Low Oil Pressure - (See above)Valve Body Assembly - Spacer Plate or gaskets misassembled or damaged.

- Solenoid disconnected or damaged.No or Slipping 2-3 Shift Valve Body Assembly - Spacer Plate or gaskets misassembled or damaged.No or Slipping 3-4 Shift Valve Body Assembly - Spacer Plate or gaskets misassembled or damaged.

- Solenoid disconnected or damaged.No or Slipping Reverse Valve Body Assembly - Spacer Plate or gaskets misassembled or damaged.

Oil Pump - P/R Retaining Ring not fully seated in groove.External Linkage - Manual Shift Lever Linkage Misadjusted.

No TCC Apply TCC Solenoid - Solenoid disconnected or wiring damaged.

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NOTE: Complement your B&M Transpak Kit with some of the following products. Check the B&M website atwww.bmracing.com for various options:

B&M Remote TPS(Must be used with #120001)

# 120002

B&M Drain Plug Kit# 80250

Cast Aluminum Deep Pan(Adds 3 qt.)

# 70295For 4L80E 1993-1998

B&M Trick Shift(For Pre-2000 vehicles)

# 80286

Technical ServiceA highly trained technical service department is maintained by B&M Racing and Performance to answer your

technical questions, provide additional product information and offer various recommendations.Technical service calls, correspondence, and warranty questions should be directed to the following address:

B&M Racing and Performance1500 Overland Ct

West Sacramento, CA 95691Phone (808) 544-4761

Monday-Thursday 6AM to 12PM AND 1PM to 5PM PSTFriday 6AM to 130PM

B&M Transmission Oil Cooler# 70264 (SuperCooler)# 70297 (Hi-Tek Cooler)

B&M Shift Plus 2Transmission Controller

# 120001

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