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Thank you for choosing B&M, Theperformance company with over 40years experience designing andmanufacturing quality highperformance automotive drivelinecomponents.

Before proceeding with theinstallation please read all of the B&M4L60E Shift Improver Kit installationinstructions so y ou will be familiarwith the series of steps required tooinstall this kit. We have made everyeffort to include more than enoughinformation to assist any­one withminimum mechanical experi ence toinstall this kit.

The B&M 4L60E Shift ImproverKit mechanically recalibrates yourtransmission to produce firm positiveshifts, this helps reduce clutch packheat build up and improvestransmission durability. This kit doesnot change or modify shift point RPMin any range. All transmission shiftpoint RPM and pressure controlfunctions remain under full PCM(Powertrain Control Module) controlas they were originally.

No recalibration kit can fix analready ailing transmission. If your4L60E is slipping, overheating,

Installation InstructionsTranspak

1991-2001 GM 4L60EPart Number 70365

(see www.bmracing.com for the latest application and fitment information)©2006, 2002 B&M Racing and Performance Products

9500582-03Printed in U.S.A,

shifting irregularly or making noise,you should have it repaired before or,in conjunc­tion with the installation ofyour B&M 4L60E Shift Improver Kit.

General 4L60E Information

B&M’s 4L60E Shift Improver Kit wasdesigned to provide firm positive shiftquality and improve transmissiondu­rability in original vehicleinstallations and those with moderateengine power improvements. This kitwas not de­signed for and is notsuitable for all out racing applications.Your 4L60E Transmission iscontrolled by the (PCM) which hasfull control of the 4L60E’s operation.All of the param­eters that controlfluid pressures, shift point RPM andTCC (Torque Converter Clutch)Iockup speed have beenpreprogramed into the PCM at thefac­tory. We have designed this kit as an easyway to overcome the less desir­ablefeatures of the factory calibratedimperceptible shifts. With this kit youcan set the shifting characteristics ofyour 4L60E to one of two levels ofper­formance, Heavy Duty or Street.Heavy Duty level produces a solid,

noticeably firm shift when comparedto the stock shift feel. While Streetlevel produces a slightly quicker andmore ag­gressive shift compared toHeavy Duty level. After installing theB&M Shift Im­prover Kit the actualshift feel you get will depend on thefactory PCM calibration, AutomaticTransmission Fluid (ATF)temperature and the type of ATF youhave used. As ATF temperatureincreases it becomes thinner (lessviscous) which allows the fluid to flowfaster through small orifices therebyproducing faster shift rates. Inaddition to the effects of temperature,each type of ATF (B&M SyntheticTrick Shift, Dexron III, Mercon etc.)has a specific characteristic frictionproperty. This characteristic frictionproperty is one of the variables thatdetermines shift feel and clutch torquecapacity. Dexron/Mercon type ATF’swere formulated to produce smoothimperceptible shifts. Both Mercon/Dexcron III and B&M SyntheticTrick Shift ATF’s are suitable for usein your 4L60E transmission. ForMaximum performance and positiveshift feel we recommend B&MSynthetic Trick Shift ATF.

PLEASE R

EAD INSTRUCTIO

NS BEFORE

SETTING U

P TO INSTALL

KIT

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Special Instructions

Metric tools are required todisassemble and assemble the4L60E, see tool list at rear of thisbooklet. Choose a clean, dirt and dustfree place to work on your 4L60E.Dirt, loose threads from rags andpieces of old gaskets can becomelodged in valve bores and/orseparator plate orifices and cause thetransmission to malfunction. If you donot have a solvent cleaning setupavailable, get several cans of WD40to clean your parts.Warning: Almost all cleaningsolvents pose a threat of fumes andor fire. Make sure to use cleaningsolvents only in a well ventilatedlocation away from any source ofignition such as open flames, sparks,hot water heaters, etc.Be careful with the internal andexternal wiring harness. Wiring and/or connectors are easily damagedand difficult to troubleshoot if they aredamaged.

VERY IMPORTANT

Use petroleum jelly to holdcheckballs and gaskets in placeduring installation. DO NOT use anykind of wheel bearing grease to holdcheckballs in place, these greases donot melt or mix readily with ATF andcan block shift and pressure con­trolsolenoid feed circuit filters andorifices. Causing erratic shifts andpotentially serious transmissiondamage because of low linepressure.

Cautions about PCM.

The MIL (Malfunction Indicator Lightor Check Engine Light) may beilluminated (turned ON) if the vehicleis started and any of the transmissionelectrical connectors aredisconnected or has wires that arebroken or, have been pinched and/or shorted. The MIL is pro­grammedto illuminate whenever a system(engine or transmission) componentmalfunctions and at the same time aDTC (Diagnostic Trouble Code) is setin the PCM. You may have to refer toyour owners manual, a GM service

manual or visit a GM dealer todetermine the source of themalfunction(s) that cause(d) any DTCcodes to be set and the requiredremedy. Make sure your engine is ingood tune and any problems relatedto set trouble codes are repairedBEFORE attempting to install yourB&M Shift Improver Kit.Do Not attempt to jumper the DataLink connector to read a DTC fromthe PCM in 1993 / 1995 vehicles un­tilyou have checked your ownersmanual, or GM service manual, orverified with your GM dealer that theparticular PCM in your vehicle allowsjumpering the data link. Jumperingthe data link connector to read DTC’sis not possible on any 1996 or laterOBD II vehicle and can damage thePCM and result in a very expensiverepair bill. Except for some 1993 to1995 PCM’s all others will require theuse of a diagnostic scanner to read.Some DTC codes are “hard codes”and may require a diagnosticscan­ner to turn them off after themalfunc­tion, which set the DTC, hasbeen repaired.If electrical power to the transmissionis cut or the PCM fails the 4L60E willoperate in “limp home” mode, if thishappens, you will only have Reverseand Drive 2 range availble.Before installing your Shift Improver

Kit there are several other B&Mproducts you may wish to consider:TRICK SHIFT PERFORMANCEATF. Trick Shift performanceAutomatic Transmission Fluid is theindustry’s only real perfor­manceATF. A specially blended oilformulated with foam inhibitors,ex­treme pressure agents and shiftimprovers, this fluid assuresprotection while delivering the fastestpos­sible shifts. You literally “Pour inperformance”. Available at your B&Mdealer.TRANSMISSION OIL COOLER. Wefeel that it is very important that everyvehicle used in heavy duty or highperformance application should havean auxiliary oil cooler. Excessive heatis the primary cause of transmissionfailures, an and auxiliary oil cooler isan inexpensive safeguard againstoverheating and failure. B&M offersa wide range of transmission coolersto suit every need and are availableat your B&M dealer.DRAIN PLUG KIT 80250. 4L60Etransmission oil pans do not comefrom the factory equipped with drainplugs. The B&M Drain plug kit isinexpensive and easy to install. Iteliminates the mess when chang­ingfluid or on pan removal.TEMPERATURE GAUGE KIT80212. Most transmission and

Transmission ID Pad4 JY D XXXX

Year Model Model designator D=4L60E

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VALVE BODY FASTENERSID Metric sixe Inch Length QtyA M6 X 1.0 X 65 2.56 (4)B M6 X 1.0 X 54.5 2.14” (3 )C M5 X 1.0 X 47.5 1.87” (9)D M6 X 1.0 X 18.0 0.71” (5)E M6 X 1.0 X 35.0 1.38” (4)F M8 X 1.25 X 20.0 0.79” (1)G M6 X 1,0 X 12.0 0.47” (2)

Keep servo vent hole clear.Avoid using sealer on pan gasket Not all valve bodies will look exactly like the one

show above

A B C D E F G

f

F

F

A

D

A

G

X

A

A

B

B

B

C

C

C

C

C

C

C

C

C

D

D

DD

EE

E E

G

X

Oil filter sealbore

TCCsolenoid

1-2 accumu-lator housing

Separator platesupport plate

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converter failures can be traceddirectly to excessive heat. The B&Mtransmission temperature gauge cansave you a costly repair bill bywarning you of an overheatedtransmission. The B&M temperaturegauge comes with all necessaryhardware and is easy to install.

Preparation

Automatic transmissions operate attemperatures in the range of 150 and250 Fahrenheit. We recommend thevehicle be allowed to cool forseveral hours before disassemblyto avoid burns from hot oil andparts. The vehicle should be raisedso there is at least 2 feet groundclearance for ease of installationand safety.MAKE SURE THE VEHICLE ISRIGIDLY AND SECURELYSUP­PORTED, JACK STANDS,WHEEL RAMPS OR A HOISTWORK BEST, DO NOT USE JACKSALONE.

Have an oil drain pan ready tocatch oil and a tray on which to putsmall parts so they won’t get lost.

It can never be said enough: Makesure you have a clean, dust free placeto work. Burrs and dirt are the numberone enemies of an automatictransmission. Contam-ination in thevalve body or pressure regulatorvalve train can result in serioustransmission damage and/orunpredictable operation.Transmission compon-ents areprecision fit, work slowly and do notforce any parts.This kit contains all parts necessaryto obtain two different shift feel levelsof performance depending on theintended use:1. Heavy Duty level; Towing,campers and, 4-wheel drive vehicles.Shift feel is firm and positive.2. Street level; Dual purposeperformance vehicles, street and stripperformance cars. Street levelproduces the firmest shift feel.

Disassembly

STEP 1. Position your drain panunder the transmission to catch ATF.Remove oil pan by first removing rear

pan bolts, then work towards the front.Loosen but do not remove the threefront bolts. If the pan sticks to thegasket, insert a flat screwdriverbetween the pan and case and prydown gently to break pan loose. Nowslowly back out the front three boltsto permit draining the ATF. Removepan gasket material from pan andcase flanges.STEP 2. Remove oil filter from caseby gently pulling it straight down. Iffilter is clogged or if transmission hasover 50,000 miles on it, the filter andfilter seal should be replaced.STEP 3. There are several differentwiring harness configurations usedon the 4L60E. Before proceedingfur­ther, make a sketch and somenotes describing your particular unit,re­cording which connectors go towhich solenoid (See Fig. 2). Noticehow the connectors and wires arecolor coded. Remove connectorsfrom pressure switch assembly andsolenoids then tie the wires up out ofthe way.STEP 4. Remove all except thecenter valve body bolt and the 2pressure switch bolts marked X (SeeFig. 2) If you do remove all five boltsfrom the pressure switch, be sure torecover all 5 switch assembly O-ringseals as it is removed. Hold the valvebody firmly with one hand andremove the remaining bolt slowly.Notice how the Manual Valve Link isengaged to the Manual Valve as youremove the valve body from case.There are seven check balls in thevalve body along with several pintsof oil. Have your drain pan ready to

catch the oil and check balls (shouldthey fall out). Save all the check ballsin a secure place where they won’tget lost.STEP 5. Remove the separator platesupport plate. Remove the 1-2accumulator housing while holdingthe separator plate up to the case.Then slowly lower the separator plateand retrieve the check ball locatedabove the plate. Important: Make anote of the color and location of the1-2 and 2-3 accumulator springs forcorrect reassembly (See Fig’s. 7-10). Remove all old gasket materialfrom separator plate, valve body andcase surfaces.STEP 6. Remove pin from 3-4accumulator piston in case. Remove3-4 accumulator piston from casebore. Remove 1-2 accumulator pistonfrom 1-2 accumulator housing. Becareful not to damage piston sealsor scratch piston bores whileremoving pistons.

Pressure Regulator

STEP 7. Heavy Duty and Street;Remove the snap ring at the end ofthe pressure regulator bore (See Fig.3). Use a screwdriver to push againstthe spring loaded Boost Valve sleevewhile removing the retaining ring.Remove Boost Valve Sleeve andValve and the Pressure RegulatorSpring. The Pressure RegulatorValve may fall out but it does not haveto be removed. Reassemble thepressure regulator assembly asshown (See Fig. 4) using the GREENPressure Regulator Spring from thekit. Use the new retaining ring

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included with kit. Important: Make surethe retaining ring is fully seated in itsgroove when assembled. If theretaining ring is not fully seated in itsgroove, the pressure regulatorassembly will blow out of its boreresulting in NO LINE pressure.

ModificationsSTEP 8. Carefully remove the snap-in solenoid oil fi lters from theseparator plate. Using the supplieddrills, enlarge the holes in yourseparator plate as shown in (Fig. 5).Before dril l ing, mark the holelocations and dril l size on theseparator plate and double checkthemagainst the illustration. Make sure touse the correct drill size specified forthe performance level (Heavy Dutyor Street). Remove burrs and cleanthe separator plate after drilling holes.STEP 9. Install Aluminum Plug inSeparator plate (See Fig. 6). WithPlug installed in hole, hold Separatorplate parallel to anvil and strike plugsquarely with a hammer. Peen plugjust enough so it is snug in the holeand will not fall out easily.

Reassembly

STEP 10. Place check balls in valvebody and case (See Fig. 12) in the

positions shown. Use a dab ofpetroleum jelly to hold check balls inposition. Double check the checkballplacement against the provideddiagram to prevent misplacement.Improper checkball placement canresult in severe transmissiondamage.STEP 11. Snap new solenoid filtersinto separator plate (See Fig. 5).Make sure filters are on the correctside of separator plate, Place eachnew separator plate gasket on theseparator plate and check to makesure no holes in the separator plateare covered by the gasket. Usepetroleum jelly to stick gaskets to

separator plate during installation. Thegasket with the ‘C’ cut in it goes nextto the case and the gasket with the‘V’ cut in it goes next to the valve body(See Fig. 11).If your gaskets becomedamaged anytime during theinstallation of the kit, replace them. Ifyou can-not obtain B&M replacementgaskets then purchase OEM gasketsfor your specific year and modelvehicle.STEP 12. Heavy Duty Level Only; (SeeFigures 7 or 9) Place the 3-4Accumulator Pin in the case. Over thepin place the Spacer, 3-4Accumulator Piston and Stock Spring(spring is installed at step 14).

Figure 4

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Remove the spring and piston from the1-2 Accumulator Housing. Over the pinInstall the spacer, piston (noticeorientation) and spring. Usepetroleum jelly to hold components inplace. Proceed to step 14.STEP 13. Street Level Only; (SeeFigures 8 or 10) Place the 3-4Accumulator Pin in the case. Over thepin place the spacer and 3-4Accumulator Piston, using petroleumjelly to hold them in place. Removethe spring and piston from the 1-2Accumulator Housing. Install bothspacers over the pin, then the piston(notice orientation). No 1-2 or 3-4accumulator springs are used forStreet level shift performance.STEP 14. Make sure the 2-4 BandAnchor has not fallen out (See Fig.12). With the 3-4 Accumulatorcom-ponents and the case check ballin place, place the Separator Plateand gasket assembly up to the casefollowed by the 1-2 AccumulatorHous-ing assembly. Carefully line upthe gas-kets and install accumulatorhousing and support plate. Tightenbolts finger tight ONLY (See Fig. 2).STEP 15. Make sure Valve Bodycheck balls are in correct locations(See Fig. 12). Position the manualvalve so the manual valve link canbe engaged (See Fig. 4). The manualvalve link must be placed into the holein the manual valve at a right angleto valve axis, then rotated 90 degreesto allow the valve to enter the manualvalve bore. Do not force valve or linkat any time. When the valve is fullyengaged, align the valve body andcase holes and install one bolt fingertight to hold valve body in place.Refer to your sketch and notes toproperly position wire harness clipsand solenoid connectors. Install all ofthe remaining bolts finger tight tofinish lining up the separator plateand gaskets (See Fig. 2). Tighten allthe valve body, accumulator andsupport plate bolts to 11 Nm (8 Lb.Ft.). Avoid striped threads. Do notover tighten bolts.STEP 16. Double check yourin-stallation;1: make sure all bolts are installedand torqued.

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2: Wiring harness is properlycon­nected.3: Regulator valve retaining ring fullyseated in groove. Coat the filterpickup tube with clean ATF then pushthe filter tube into the pump bore untilit is fully seated.STEP 17. Remove any old pangas­ket material from pan and casepan rail. Clean inside of pan withsolvent. You may want to install aB&M Drain plug kit (80250) at thistime. Install the new Pan Gasket onthe pan and align the holes. Usepetroleum jelly to help hold the gasketin place during installation of pan. Donot use any gasket sealer or siliconecompounds. To prevent prematureband failure make sure the vent holeshown in Fig. 2 is not blocked or

obstructed. Place pan up to case,align holes and install all bolts fingertight. Tighten bolts to 12 NM (9 Lb.Ft.). Do not over tighten bolts. If thebolts are over tightened the gasketwill deform excessively and result inoil leaks.STEP 18. Fill transmission with ATFto the full mark on dip stick. You willneed about 4 to 6 quarts. Dexron III®is fine for Heavy Duty Levelapplications however, werecommend B&M SyntheticTrick ShiftATF for Street level ap­plications. Withvehicle still off the ground, start theengine and shift transmission throughall gears.Check for leaks around oil pan flangeand drain plug. Place selector in

neutral and check the fluid level. Stopengine and then lower vehicle.STEP 19. Test drive vehicle andre­check for leaks while transmissionis hot. Check fluid level again,adjusting level as required.

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ERROR CONDITION WHERE TO LOOK FOR CAUSEHigh or Low Oil Pressure Oil Pump - Pressure Regulator Valve Stuck.

- P/R Retainnig Ring not fully seated in groove- Orifice hole in P/R Boost Valve sleeve plugged.

Oil Filter - Cracks in Filter Intake Tube.- Intake Tube Seal Damaged.- Wrong grease used on reassembly (clogging filter).

Valve Body Assembly - Spacer Plate or Gaskets misassembled or damaged.- Check Balls omitted or mislocated.- Wrong grease used on reassembly (clogging Solenoid

Filter.)Harsh Shifts Valve Body Assembly - Wrong holes drilled.

- Separator Plate or gaskets misassembled or damaged.- Check Balls omitted or mislocated.

Inconsistent Shift Points Valve Body Assembly - Separator Plate or gaskets misassembled or damaged.External Linkage - Manual Shift Lever Linkage misadjusted.

No or Slips in 1st Gear 1-2 Accumulator - Damaged or missing piston seal.- Incorrect spacer(s) holding piston above case surface.

Low Oil Pressure - (See above)Valve Body Assembly - Spacer Plate or gaskets misassembled or damaged.

- Check Balls omitted or mislocated,- Solenoid disconnected or damaged,- 2-4 Band Anchor missing

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

3-4 Accumulator - Damaged or missing piston seal,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.No TCC Apply TCC Solenoid - Solenoid disconnected or wiring damaged.

TOOL LIST

1 3/8" drive ratchet wrench1 3/8" torque wrench1 2"-6" 3/8" drive extension1 8, 10, 13mm Sockets1 8, 10, 13mm combination wrench1 8" Plain Screwdriver1 Small Internal Retaining Ring Pliers1 Needle nose pliers1 Hammer1 Gasket scraper1 3/8" Drill motor1 Fine cut fiat file1 Wet or Dry sand paper

PARTS LIST

1 Pan Gasket1 Upper Valve Body Gasket1 Lower Valve Body Gasket2 Snap in Solenoid Filters Aluminum Plug1 GREEN Press Regulator Spring1 Press Regulator Retaining Ring1 3/8"x 5/16" ID RED Spacer1 1/2"L x 5/16" ID GREEN Spacer1 5/8"L x 5/16" ID YELLOW Spacer1 3/4"L x 5/16" ID BLUE Spacer1 19/32"L x 1/4" ID VIOLET Spacer1 3/8"L x 1/4" ID WHITE Spacer1 3/32" (.094) Drill 1/8" (.125) Drill1 1/2" x 1" x 2" Anvil Plate