Bulletins

BulletinBulletin dateReplacement BulletinItem no.SummaryAdded
POWER TRAIN
00773100171904l60e, 4l65e replacement valve body gaskets does not seem to fit. *tt10/27/2005
3276100134964l80e output carrier thrust washer changes. *tt04/20/2005
0824200408/24/200410013097Bearing growl or rattle type noise while depressing or releasing the clutch pedal. *tt04/07/2005
03073003107/01/200310012566Transmission leaks, slips, vehicle will not move. *tt03/07/2005
04073100101/01/200410011131Revised clutch pressure plate adjustment. *tt01/03/2005
04073100612/01/2004040731006A10011070Excessive shifter and/or engine vibration, bearing growl and/or rattle type noise while depressing or releasing clutch pedal. *tt12/28/2004
320510010861Allison lct1000 pump separator plate change disregard additional valve. *tt12/15/2004
31563156A10010292261 transfer case drivelines growl 1100-1200 rpm. *tt11/09/2004
309201/01/200410010222Allison lct 1000 buzz noise feel on tcc apply. *sc11/04/2004
313001/01/20043130A10010079Allison lct 1000 prndl flash and/or will not move. *tc11/04/2004
305401/01/200410009665Replacement flexplate may have larger bolt holes than the original flexplate. *tt10/14/2004
1029200210/29/200210009574Delayed transmission engagement from park to drive or reverse, malfunction indicator lamp, range inhibit and blinking prindel, multiple diagnostic trouble codes. *tt10/07/2004
30833083B10009506M74 allison lct1000 pto gear applications. *tt10/04/2004
30023002D100088024l60e/4l65e intermittent neutral condition while accelerating from a stop or while driving. *tt 1999-2006 gm cars, light duty trucks and utilities. *tt08/23/2004
030730011B04/01/2005030730011C10008638Transmission slips, delayed engagement, cold hesitation, intermittent, poor performance, power, shift, dtcs p0701, p1709, p1711, p1713, p0841, p0843, p0847, p0870, p0872, or p0875. *tt08/11/2004
990730016A10/01/2002990730016B10007838Diagnostic information for intermittent transmission downshift, slip, busy/cycling tcc or noisy cooling fan. *tt07/12/2004
0197701/01/200401977A10007580Allison lct1000 prndl flash and/or will not move. *tt07/01/2004
0002901/01/200400029A10007579Allison lct1000 may experience a neutral feeling when coming to a stop. *tt07/01/2004
0211301/01/200410007455Intermittent no forward or reverse with possibly either a flashing prndl display or a range shift inhibited message. *tt06/23/2004
0159901/01/2004100072374l60e, 4l65e forward and low reverse waved steel clutch plate appearance change. *tt06/04/2004
00822B01/01/200400822C10005474No 2nd, no 4th and no reverse. to include 2004 light duty automobiles and trucks equipped with 4l60e or 4l65e automatic transmission. *tt02/27/2004
03073005411/01/200310004744Transmission fluid leaks out of vent when truck is started after a cold soak. *tt01/05/2004
010730002C08/01/2003010730002B10004354Malfunction indicator lamp (mil) is on; the transmission is stuck in third gear; and / or the instrument cluster is inoperative. *tt12/03/2003
0141011/18/200310004214Poor performance from a stop in 2wd, auto or 4wd hi. 2003, 2003 cadillac ext also included. *tt11/21/2003
01129A11/18/200310004170Allison lct1000 serviceability. *tt11/20/2003
08040308/04/200310003869This vme message applies to the valve body for the allison series 1000 transmission revised for the 2004 model year to add modulated main pressure control. this revision will provide additional transmission oil cooler flow and reduce pump11/05/2003
03042100405/01/200310002374Design change of rear output shaft and oil pump replacement parts. *tt08/26/2003
020421005A02/01/200302042100510001110Slips in 4-wheel drive, noise, vibration, leaks, hot odor. *tt04/15/2003
02042100506/01/2002634905Some vehicles will not move when 4-wheel drive is requested, noise, shudder, poor performance, transmission / transfer case slips, transmission will not upshift, slips in 4-wheel drive. *tt10/10/2002
02009000204/01/2002634226Subject regarding lubrication of propeller shaft double cardan cv type u-joint centering ball and seat.*nlm09/28/2002
22010201/22/2002629716Some four-wheel drive extended cab short bed models may exhibit a bump/clunk on stop or acceleration. *tt04/05/2002
POWER TRAIN - AUTOMATIC TRANSMISSION
02073001106/01/200410012151Slow or no engagement of automatic transmission no start blank prndl display flashing prndl diagnostic trouble code p0708 p0872 p0847 p0875 p1711 p1713 or u1000 set. this service bulletin replaces 020730011. *eh02/15/2005
316110010546Allison lct1000 clunk noise on start in park. *eh12/01/2004
304701/01/20043047A1001018500-01 4l80-e automatic transmission may experience a harsh tcc apply and/or diagnostic trouble code p1870 or p074. *tc11/04/2004
30573057A10009668Allison lct1000 pump whine noise. *tt10/14/2004
3055901/01/200410009674Allison lct1000 diagnostic trouble code p1711, p0872 after completing repairs. *tt10/14/2004
304701/01/200410009392Harsh tcc apply and or a diagnostic trouble code p1870. 4l80e automatic transmission. *tt09/27/2004
0085601/01/200400856A10007815Allison lct1000 oil pump whine, buzz on cold start. *tt07/12/2004
01932325410006495Allison lct1000 dark or discolored transmission fluid with no loss of performance. *mr05/04/2004
03073005711/01/200310005581Transmission fluid leak from front of transmission - torque converter housing/pump area. 2500/3500 series models. *tt03/04/2004
03073005611/01/2003100055664l60-e automatic transmission oil pump first and second design identification. *tt03/04/2004
030730307A11/01/200303073003710005580Transmission oil leak, abnormal knocking noise heard at idle. 2500/3500 series pickup models. *tt03/04/2004
020730030A11/01/200302073003010005536Some customers may comment that the transmission slips, a shudder, chuggle, or vibration is felt when the transmission shifts from first to second gear. *tt03/02/2004
0149301/01/200410005508Allison lct1000 prndl flash and/or will not move with p0721, p0731, p0732, p0733, p0734, p0743, p0746, p0747, p0776, p0777, p1720, p1721, p1723 and p1724. *tt03/01/2004
3259C3259E100055144l80e, 4l85e whine noise in first and second gear. *tt03/01/2004
030730037B12/01/2003030730037A10005169Transmission oil leak, abnormal knocking noise heard at idle. *tt02/10/2004
010730038B10/01/2005010730038C10005162The service engine soon lamp is illuminated, no 3rd and 4th gear, the transmission does not shift correctly, the transmission feels like it shifts to neutral or a loss of drive occurs. *tt02/09/2004
03073005310/01/200310004747Allison automatic transmission valve body hardware changes. *tt01/05/2004
030730031D02/01/2006030730031E10004379Transmission leaks, slips, vehicle will not move. *tt12/04/2003
03073003810/01/2005030730038A10004323Transmission oil leak, abnormal knocking noise heard at idle. 2500/3500 series pickup models. *tt12/02/2003
03073004408/01/2004030730044A10004326Information on allison transmission service repairs - full service of internal components. *tt12/02/2003
03073003709/01/200310004322Transmission oil leak, abnormal knocking noise heard at idle. 2500/3500 series pickup models. *tt12/02/2003
00557B11/18/200310004190The allison lct1000 transmissions may experience a leak from oil pump area. *tt11/21/2003
020730051A02/01/200302073005110001116Transmission shifting in and out of 4th and 5th gear (hunting) when pulling/carrying a load, unable to manually select 4th gear. *tt04/15/2003
02073005112/01/200210000761Transmission shifting in and out of 4th and 5th gear (hunting) when pulling / carrying a load, unable to manually select 4th gear. hd2500/hd3500 series. *tt03/28/2003
020730011A05/01/2002020730011634961Diagnostic information for possible gear indicator (prndl) concerns for vehicles with allison lct1000 automatic transmission. *tt10/10/2002
02073002005/01/2002634959Some customers may comment of harsh or delayed 2-1 downshift, neutral feel at a stop, shift busyness, diagnostic trouble codes p0708, p0847, p0872, p0875, p1711, p1713 from 3/4 and 1 ton pickup models. *tt10/10/2002
020417001A07/01/2002020417001634895Concerns with launch shudder / vibration on acceleration. *tt10/10/2002
02073003008/01/2002634947Some customers may comment that the transmission slips, a shudder, chuggle, or vibration is felt when the transmission shifts from first to second gear. *tt10/10/2002
02073000409/01/2006020730004C631800New product information, grade brake feature of allison 1000 series transmission. *slc this bulletin replaces 02-07-30-004. *tt06/20/2002
02073001103/01/2002631670Subject regarding, 2001-2002 chevrolet and gmc c/k pickup and utility models, diagnostics for possible gear indicator concerns. *jg06/10/2002
02073001103/01/2002631259Subject regarding, 2001-2002 chevrolet and gmc c/k pickup and utility models, diagnostics for possible gear indicator concerns. *slc05/21/2002
02041700102/01/2002629369Some owners of c1500 series extended cab pickup models may comment on a vibration/launch shudder when accelerating from a stop. *tt04/02/2002
01073003812/01/2001010730038D628934Some customers may comment that the service engine soon lamp is illuminated, no 3rd and 4th gear, the transmission does not shift correctly, the transmission feels like it shifts to neutral or a loss of drive occurs. *tt03/25/2002
01073004312/01/2001628815Subject regarding diagnostic tips for slipping or missing second, third and/or fourth gear. *tt03/21/2002
03100110/03/2001627870Information regarding a 1-2 shift shutter, which may occur on light throttle acceleration, usually when the vehicle is thoroughly warmed up. *yh02/25/2002
01073003411/01/2001627632Information regarding 5-4 shift busyness (excessive shifting) while using cruise control and towing. (c/k 2500/3500 series pickup models) *yh02/13/2002
20080108/20/2001625114Information regarding revised transmission calibration to address driveline growl or prop shaft ring noise. *jg11/16/2001
01060106/01/2001619765Subject regarding an investigation of 2-4 band or 3-4 clutch damage on 4l60e automatic transmission. *tt06/28/2001
01-60106/01/2001619762Subject regarding investigation of harsh shifts on 4l60e automatic transmission. *tt06/28/2001
02040104/02/2001619402Some customers have commented that when in four-wheel drive and in reverse gear engine speed will not go over 1,000 to 1,300 rpms. *tt05/29/2001
POWER TRAIN - AUTOMATIC TRANSMISSION - CONTROL MODULE (TCM, PCM)
429012/01/200710023751Engine surge or stall at stop and/or dtc p0742 possible tcc applied. equipped with allison lct1000 transmission rpo m74 or mw7. *nj01/30/2008
00938B11/18/200310004179Allison lct1000 repeat transmission control module (tcm) failures with possible multiple diagnostic trouble codes (dtcs). *tt11/20/2003
POWER TRAIN - AUTOMATIC TRANSMISSION - COOLING UNIT AND LINES
PIT-472210/01/200810026804Gmc: fluid leak from transmission oil cooler lines due to corrosion. all 2000-2006 light duty trucks equipped with the light duty automatic transmission. *pe12/18/2008
314301/01/200410010247Transmission oil cooler line fitting clarification. *tc11/08/2004
POWER TRAIN - AUTOMATIC TRANSMISSION - LEVER AND LINKAGE - COLUMN SHIFT
0185601/01/200410006712Allison lct1000 will not shift from park due to ice, snow or mud build-up on shift linkage. *mr05/11/2004
020730024A08/01/2005020730024B634999Diagnosis of cracked or broken transmission case. *tt 2006 and prior cars and light duty trucks. *tt10/11/2002
POWER TRAIN - AUTOMATIC TRANSMISSION - TORQUE CONVERTER
00252B01/01/200410005507Allison lct1000 knock noise and possible leak from the torque converter area. sit bulletin 1401124. *tt03/01/2004
POWER TRAIN - AXLE ASSEMBLY
40304030A10021676New design front axle side bearing adjusters. *kb06/15/2007
336410014953Rear axle retainer button breakage. *eh05/12/2005
30013001A10008872The service information and owners manual do not show a service interval for the 8.6, 9.5, 9.75, 10.5, and 11.5 inch rear axles with or without g80 (locking differential). *tt 2006 all general motors light duty trucks, vans and utilitie08/25/2004
03041800306/01/200310002854Revised wheel drive shaft inner joint and seal replacement. *tt09/26/2003
03041700503/01/200310001271Whine noise from front axle. *tt04/25/2003
POWER TRAIN - AXLE HUBS
01222A01/01/200401222B10007278Repeat rear axle hub seal leak. *tt06/09/2004
POWER TRAIN - CLUTCH ASSEMBLY
387010020238Clutch pedal fade or clutch will not disengage typically when towing. *tt08/21/2006
POWER TRAIN - CLUTCH ASSEMBLY - PEDAL/LINKAGE
302101/01/20043021B10008770Clutch pedal assembly squeak noise. the condition typically occurs during hot ambient temperature. *tt08/23/2004
POWER TRAIN - DRIVELINE
33003300A100135724wd models with noise, vibration on dry pavement. *eh04/21/2005
POWER TRAIN - DRIVELINE - DIFFERENTIAL UNIT
990421003C08/01/2003990421003B10004401Front wheels slipping with vehicle in four wheel drive. *tt12/05/2003
990421003B04/01/2001990421003A619378Some owners may comment on a slipping type condition at the front wheels while the vehicle is in four wheel drive (4wd). *tt05/24/2001
POWER TRAIN - DRIVELINE - DRIVESHAFT
04049500103/01/200410008653Revised wheel drive shaft nut torque specification. *tt08/12/2004
POWER TRAIN - MANUAL TRANSMISSION
414410022360Allison lct1000 harsh 3-2, 2-1 downshift, and abs may activate. *kb08/03/2007
60909/01/200410016217Clutch pedal squeak. *sc09/02/2005
0925200209/25/200210008627This message is about hydraulic fluid usage for the hydraulic clutch system. *mj08/10/2004
00908D01/01/200400908E100054416.6l and manual transmission growl noise while engaging or disengaging clutch. *tt *mj02/27/2004
00908C01/01/2003100044096.6l and manual transmission growl noise while engaging or disengaging clutch. these are c/k models. *tt12/05/2003
4101/01/2002637387Some vehicles equipped with the allison lct1000 transmission may experience a very harsh 2-1 downshift at a stop or on throttle reapply. *tt11/25/2002
13110111/13/2001628117Information on 4-wheel drive extended cab, short bed vehicles with 4-wheel drive extended cab, short bed with a bump or clunk on stop or acceleration. *tt03/05/2002
01110111/01/2001628081This message covers trucks with four-wheel drive extended cab short bed with a bump or clunk on stop or acceleration in reference to bulletin number 01-04-17-004. *tt03/05/2002
25100110/25/2001628027Some extended cab short bed vehicles with four-wheel drive may exhibit a bump or clunk on stop or acceleration from a stop. *tt03/01/2002
01073003611/01/2001627912Service engine soon lamp illuminated, incorrect transmission shifts, poor performance of engine, transmission slipping. *yh02/26/2002
0103205/01/2001619383Some vehicles equipped with 6-speed manual transmission may exhibit a condition in which the clutch fluid is contaminated by water that has been introduced through the reservoir cap. *tt05/24/2001
POWER TRAIN - TRANSFER CASE (4-WHEEL DRIVE)
34243424A10017299Electronic transfer case unable to complete shift. *tt11/02/2005
338910016707Four wheel drive inoperative and the 4wd service light will illuminate. diagnosis may reveal that the atc fuse could be open, possible dtc c0308, or various u codes may be set. the encoder motor may also be shorted or the tccm may be dama09/28/2005
352610016558Intermittent service 4wd light comes on with diagnostic trouble code (dtc) c0306 or c0308 stored in tccm. *tt09/22/2005
3349100148094wd inoperative and diagnostic trouble code (dtc) u1026 atc fuse open. *tt05/10/2005
3132A3132B10010024Nvg149 np3 transfer case may exhibit a bind or shudder on turns. *tc11/03/2004
3012B3012A10008806The nvg 136 all wheel drive (awd) transfer case and the 236 and 246 nvg selectable transfer cases operating in the auto mode may exhibit a condition of a vibration/shudder during low speed turns such as a parking lot maneuver, up to approxi08/23/2004
02042100404/01/2002634899Some customers may comment on the service 4wd indicator illuminating with diagnostic trouble code b2725 set. *tt10/10/2002

Consumer Complaints

Fail datemilesoccurencesPurchase date
POWER TRAIN
07/15/20017250
 Engine uses to much oil, knocks, smokes body- truck bed sides are rippeling because the metal is to thin,& can not handel the weight of a lumber rack, front bumper is dented on both sides but in differant places, was like this at delivery, all the trucks were like this but all of them in differant places.manufacture defect exhaust- loose parts inside of muffler, exhaust rattels from mounting hardware, muffler retains water and leaks at the seams. paint-rust on the top of cab seatbelt- driver side belt will not recoil,broken seat belt bracket.(this is a safty issue) tires-below 1/32 tread left at 23,000 miles(this is also a safty issue) transmission-makes a cluncking noise at low speeds,takes a long time to shift when running the a/c also makes a howling noise,transmission slips.
POWER TRAIN - AUTOMATIC TRANSMISSION
06/17/200664000110/30/2002
 While driving on the hwy. towing my 28 ft 5th wheel trailer on level ground we experienced a loud bang and the feeling like something in the driveline had broken. no engine malfunction indicators were displayed on the console. no further incidents have happened yet, but it is constantly on my mind. *jb
02/18/2004009/27/2001
 We have a 2001 gmc crew cab that we have had for 26 months. be bought it brand new so we would be less likely to have problems. we have had 3 new transmissions (not including the factory one). it is in the repair shop again because when you put the truck in reverse it dies. not every time but it happens quite often. it was in the shop before for the same exact problem which resulted in 1 of the 3 new transmissions. lets hope it doesn't need another one. this is getting old!!!!!!!!!!!
10/01/2001
 The transmission violently shifts into gear upon acceleration from a stop or slow speed. this problem has occurred as many as ten times since the original date of purchase. on may 4th it occured so violently that the passenger in the rear hit his head on the rear window. in this incident the shift was so hard the rear wheels left the ground(all 4) and then the truck lurched forward. this is a serious defect that could caused harm to those inside the truck and could harm other drivers or pedestrians. the truck seems to go to a neutral operation even though you are in drive then when the rpms icrease to above 2,000 it suddenly shifts. i have taken the truck to the dealer 5 times and recently completed arbitration to take the truck back. the gmc represenitive claimed that this was normal for a heavy duty transmission such as the allison. the best discription of the problem is it feels as if you have been hit from the rear by another vehicle at 15-20 mph. *ak
01/01/20024
 Consumer states when applying brakes, the vehicle downshifted to a low gear and would not shift out, the back tires locked up and caused the vehicle to lock up and fishtail*ak.*slc
07/01/2001
 The transmission has a problem that causes the truck to lurch forward just after coming to a complete stop. the lurch can be quite strong causing the vehicle to jump forward in excess of a foot. the lurch occurs at unpredictable times and without warning. the best description i can offer is that it feals as if the vehicle has been hit in the rear by another vehicle. it has occured at least 6 times on various occasions.*ak
03/01/2001
 Transmission surges at all speeds. intermittent. deal states could not reproduce problem. transmission has slipped into gear while taking off from a stoplight. rpm's went up to 2000 before engaging gear.*ak
06/16/2001106/01/2001
 Automatic transmission makes gear noise in 1st and 4th gears. at purchase, vehicle had bad vibration problem. dealer balanced wheels, which did not eliminate problem. dealer tested tires and found one defective tire...the other three had to be indexed on the wheels. driveshaft, suspension components/hardware and parts of the chassis have significant rust. (tiresize: p235/75r16)
POWER TRAIN - AXLE HUBS
05/15/200320000308/27/2001
 Dt: caller said at low speeds the abs kicked in and made it hard to stop vehicle when slowing down. caller had the problem corrected three times. had them replace the abs in the spring of 2003, 2004 and in may of 2005. dealer said the first time was a hub assembly and the other two it was the rotors. manufacturer has not been contacted yet.*ak
10/14/200446499210/15/2002
 The antilock brakes engaged at 10 mph while driving on dry road conditions. the problem was repaired on october 14, 2004. the problem was due to internal hub failure in which both hubs were replaced. *ak the brakes never failed at high speeds. the abs light stayed on. *sc *jb
POWER TRAIN - DRIVELINE - DIFFERENTIAL UNIT
03/01/2001
 There was a large booming noise coming from vehicle everytime consumer drove it. this noise occurred when pulling away from a stopped position. consumer took vehicle to dealership, and they greased differential. he was told this would correct the problem. consumer still experienced the problem dealership said that there was nothing more they could do. please provide any additional information/attachments. *ak
POWER TRAIN - DRIVELINE - DRIVESHAFT
06/16/2001106/01/2001
 Automatic transmission makes gear noise in 1st and 4th gears. at purchase, vehicle had bad vibration problem. dealer balanced wheels, which did not eliminate problem. dealer tested tires and found one defective tire...the other three had to be indexed on the wheels. driveshaft, suspension components/hardware and parts of the chassis have significant rust. (tiresize: p235/75r16)
POWER TRAIN - TRANSFER CASE (4-WHEEL DRIVE)
10/01/2003630001
 Dt: the contact wa shaving problems with the push button module that engages the four wheel drive. the vehicle is getting stuck between two wheel and four wheel drive. he has talked to gm, and vehicle was not under a recall. this has been happening for three years. the vehicle has not been taken to the dealership for any repairs. *ak
09/12/2005112/12/2001
 I own a 2001 gmc sierra. i noticed that when i put my truck in 4 low on my 4x4 (manual shift),and i put the truck in reverse, you can feel the torque. when i go and put the truck into park it starts to grind while engaging in the park position. i brought it to a gmc dealership and they told me that it is normal for the transfer case to do this. if you ask me, if there is grinding noises on moving parts, something is not right or normal. *nm
12/01/200425000112/01/2000
 The consumer heard a clunking noise and a pulsating sensation in the steering column while making turns. *nm the consumer was told that the wrong lubricant was used at the factory for the steering column shaft. the shaft was unable to be lubricated because the lubricant would not penetrate between the first and second sleeve. the intermediate steering shaft was replaced and the problem got worse. four wheel drive warning light came on. *tc

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