Question about 1991 GMC G3500

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6500 gmc allison transmission wont go into park once trans warm

Same as above

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4 Suggested Answers

SOURCE: 02 gmc allison tran. wont go into tow-haul mode

THERE HAVE BEEN ALOT OF PLOBLEMS WITH THE SHIFTER HANDLE/SWITCH. THE BEST WAY TO VERIFY CONCERN IS USE A DIAG. SCANNER & VIEW TRANSMISSION DATA DISPLAY WHILE ENGINE RUNNING. THE SWITCH IN THE SHIFTER IS FAULTY. IF YOU SEE NO INPUT CHANGE WHILE DEPRESSING SWITCH THIS IS YOUR CONCERN.

Posted on Nov 08, 2008

  • 176 Answers

SOURCE: 2001 gmc 2500 6.6 w/ allison transmission,keeps

You may want to inspect the "pass-through" connector for water contamination, and/or related wiring for corrosion.

Posted on Apr 23, 2009

mcgyver468
  • 710 Answers

SOURCE: allison tranny shifts

No, have you changed the spin-on filter om the transmission yet? This may be the only trouble. I hope this helps. Good luck.

Posted on Apr 28, 2009

sodeep
  • 3267 Answers

SOURCE: I NEED A REPAIR MANUAL FOR A 202 GMC SIERRA 2500

Well the tchnical specs are available at
http://www.google.co.in/url?sa=t&source=web&ct=res&cd=9&url=http%3A%2F%2Fmedia.gm.com%2Fdivision%2F2004_prodinfo%2Fgmc%2Fpdf%2F04_GMC_Fleet.pdf&ei=VnjLSuPiNJze6AOg_JH9Ag&usg=AFQjCNFGSInnhC-fLTlqFE7yekGDKtwNCA&sig2=4uWnjikXApamQW-bb26Twg
However 202 I have assumed to be 2002 & if so then download the Users manual and trouble shooting tip from this site:
http://safemanuals.com/user-guide-instructions-owner-manual/GMC/SIERRA%202002. I hope this is what you are looking for...sodeep

Posted on Oct 06, 2009

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General Motors gear ratios
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GM Rear Wheel Drive Transmissions

PTU = Power Transfer Unit (Crossover SUV AWD/4WD)

6 Speed Automatic Transmissions

RPO Trans Name 1st 2nd 3rd
MNK Allison 1000
MNZ Allison 1000
MW7 Allison 1000
MYB
MYC

5 Speed Automatic Transmissions

RPO Trans Name 1st 2nd 3rd
M74 Allison 1000
M22 5L50-E
M82 5L40-E
MTW Allison 2400
MX4 Allison 2000
MX5 5L40-E with PTU*
MV3 5L50-E with PTU*

4 Speed Automatic Transmissions

RPO Trans Name 1st 2nd 3rd
M30 4L60-E
M32 4L60-E HD
M32 4L65-E
M33 4L60-E Hybrid
M41 4L30-E
M70 4L70-E Super Duty
M99 2ML70 2-mode Hybrid*
MD8
ML4 4L30-E
MN8 4L80-E HD
MN8 4L85-E
MT1 4L80-E
MW9 HM 200-4R
  • EVT Mode 1 The 2ML70 can operate in electric mode or non-electric mode in first gear with a gear ratio of infinity to 1.70:1.
  • EVT Mode 2 The 2ML70 operates in non-electric mode with a gear ratio of 1.70 - 0.738:1

3 Speed Automatic Transmissions

RPO Trans Name 1st 2nd 3rd
M40
M41
M65
MD2
MD3 HM-180
HM-200C
HM-350
HM-400

GM Front Wheel Drive Transaxles

6 Speed Automatic Transaxles

RPO Trans Name 1st 2nd 3rd
MH2
MH4
MH6 6T75 (AWD)
MH7
MH8
MY9 6T75 (AWD)

5 Speed Automatic Transaxles

RPO Trans Name 1st 2nd 3rd
Aisin-AW 55-51LE
M09 Aisin-AW AF33-5
M43 Aisin-AW AF23-5
M45 Aisin-AW AF33-5
M98 AF33-5
MJ7 Honda 5AT
MJ8 Honda 5AT w/PTU*
MLS Aisin 50-40E
MU3 Saab 76.5mm

4 Speed Automatic Transaxles

RPO Trans Name 1st 2nd 3rd
MLQ Aisin 81-40LE
Aisin ZF 4HP 16
HM 325-4L
Jatco JF405-E
M10 Jatco JF403-E
M13 4T60-E HD
M13 4T60-E
M15 4T65E
M45 Aisin-AW AF33
M57 A245-E
M76 4T65E with PTU*
MD7 4T65E
ME7 4T45-E BAS Hybrid
ME8
ME9
MH1 4T80-E
MN3 4T65E
MN4 4T40/45-E
MN5 4T45-E
MN7 4T65E HD
MS7 A240-E
MU4 A246-E
MU5 U341-F

3 Speed Automatic Transaxles

RPO Trans Name 1st 2nd 3rd
M60 GEO Metro
MB3 A131L
MD9
MX1 A131L
GEO Storm
HM-425

GM Manual Transmissions

6 Speed Manual Transmissions

RPO Trans Name 1st 2nd 3rd
M10 Tremec 85mm
M12 Tremec T56
ML6 ZF S6-650
ML9 ZF S6-40
MM6 Tremec T56
MV1 Aisin 85mm
MV5 Aisin D173 AY6
MV6 Aisin 85mm
MZ6 Tremec 85mm

5 Speed Manual Transmissions

RPO Trans Name 1st 2nd 3rd
M35 Getrag 260
M35 Getrag 260 (2003-2004 Cadillac CTS)
M49 BW 5spd
M50
M59 GEO Tracker
M86 Getrag F23 75mm
M94 Getrag F23
M96 Tremec 109mm
MA5 Aisin AR5 82mm
MG3 Getrag F23
MG5
M50
M51
MH3 Tremec T-5
MK5 C59
ML2 Tremec T-5
ML3 Tremec T-5
MT8
MU3 Saab F25
MW2
MW3 NV4500 109mm
TR-3450
TR-4050
TR-4050
2007 Chevrolet Optra and Spark (Trans code Y4A)
2007 Chevrolet Optra and Spark (Trans code Y4M)

4 Speed Manual Transmissions

RPO Trans Name 1st 2nd 3rd
M20 HM-117
M73 Isuzu
MC0 Getrag
MC9
MY6 NP260

More GM Manual Transmissions

6 Speed Manual Transaxles

RPO Trans Name 1st 2nd 3rd
MT2 Opel F40 83mm
MU9 Opel F40 83mm
MTN Toyota C60

5 Speed Manual Transaxles

RPO Trans Name 1st 2nd 3rd
D-16 (2005-2008 Chevrolet Aveo 1.4 DOHC / 1.5L)
D-16 (2005-2008 Chevrolet Aveo 1.4 SOHC)
Y4A (2007 Pontiac Matiz)
YM4 (2005-2007 Chevrolet Aveo)
D-20 (2005-2007 Chevrolet Epica)
L73 Pontiac LeMans F16
M42 Geo Metro
M43 AF23
M49 BW 5spd
M58 Geo Metro
M79 LeMans F13
M86 Getrag F23 (5T45MI)
M94 Getrag F23
M98 Aisin 55-51E
MB4 Geo Prizm 1.8L
MB5 Geo Prizm
MFB 2008 Chevrolet Epica 5-Speed S/R (D24)
MFN 2008 Chevrolet Epica 5-Speed S/R (D33)
MG1 HM-282
MG2 HM-282
MG3 Getrag F23
MJ1 Isuzu
MK7 Isuzu
MLM Y4M (2008 Chevrolet Aveo 1.6 DOHC)
MR3 Isuzu
MU3 Saab F25
MV2 Chevrolet Sprint
MY7 Early J-car

GM Continuously Variable Transaxles

RPO Trans Name Lowest Highest
M83 V20-E
M75 V25-E
M16 V25-E AWD

on Apr 15, 2015 | GMC Cars & Trucks

1 Answer

Gear shift lever wont go into park and ignition switch won't turn all of the way off.


Sounds like you probably bent the "detent" in the transmission. You'd need to drop the trans pan and replace the linkage pertaining to this.

Feb 16, 2014 | 1996 GMC Sierra

1 Answer

Problem with a 2003 Dodge Ram, fault codes indicate a transmission Malfuncting.Tcm scan reveals pressure switch open or closed at wrong time.


Transmission solenoids are usually installed in a transmission valve body, Transmission Control Unit, or transmission control module. If you have a question about a specific Allison Transmission model, you should call Allison Transmission Here is the number for the Texas Distribution office 214-631-5370-----------------------------------------------------------------------------
vas 5054a

Nov 28, 2012 | Cars & Trucks

1 Answer

2008 2500hd Duramax/Allison trans. Why is check engine light on?


Have codes read by someone with good scanner that reads trans codes.

Oct 28, 2012 | GMC Sierra Cars & Trucks

1 Answer

Transmission slipping on 03 GMC Envoy. what does iy mean when trans fluid measure high on dip stick?


Two things: #1 someone has overfilled it by mistake thinking they were putting oil in the engine. Yes I have seen this.
#2 The transmission cooler in the radiator could be leaking antifreeze into the transmission through the cooling line raising the fluid level. I would look for milk shake foam on the dip stick and make sure you check trans in park and not neutral.

Jan 01, 2012 | 2003 GMC Envoy

1 Answer

2001 hd 8.1 with allison. Pulled my boat up a big hill, then the tranny warmed up just below the red line, pulled over and looked under, and it was leaking. Just dripping. Put a quart of fluid in it and...


There is no overflow on the Allison Trans, something happened when the trans got over heated, it is a good idea now to also get a trans flush as once you heat it up that bad it starts to break down the fluid.

May 28, 2011 | 2001 Chevrolet Silverado 2500HD

1 Answer

Allison tranny shifts


No, have you changed the spin-on filter om the transmission yet? This may be the only trouble. I hope this helps. Good luck.

Apr 28, 2009 | 2001 GMC Sierra 2500HD

1 Answer

02 gmc allison tran. wont go into tow-haul mode


THERE HAVE BEEN ALOT OF PLOBLEMS WITH THE SHIFTER HANDLE/SWITCH. THE BEST WAY TO VERIFY CONCERN IS USE A DIAG. SCANNER & VIEW TRANSMISSION DATA DISPLAY WHILE ENGINE RUNNING. THE SWITCH IN THE SHIFTER IS FAULTY. IF YOU SEE NO INPUT CHANGE WHILE DEPRESSING SWITCH THIS IS YOUR CONCERN.

Nov 08, 2008 | 2002 GMC Sierra 2500HD

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