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Dec 30th, 2023
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 Allison won't go into gear
#1016327
10/13/06 02:49 AM
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Joined: Jul 2004
Posts: 369
jta75
OP
Angler
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OP
Angler
Joined: Jul 2004
Posts: 369 |
hey y'all I could use some help so I can fish this weekend!!!
I have an 02 GMC with the duramax/allison combo. tonight my truck wouldn't start. I jumped it and it started up but the allison wouldn't go into gear. I shifted it into gear and I got no response at all. what do y'all think could cause this? thanks!
jason
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Re: Allison won't go into gear
#1016328
10/13/06 03:21 AM
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Joined: Apr 2006
Posts: 8,475
fishinrgv
TFF Celebrity
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TFF Celebrity
Joined: Apr 2006
Posts: 8,475 |
 Geaux Tigers...1958,2003,2007 Football National Champions CWS Champs 91, 93, 96, 97, 00, 09 2009 SEC Basketball Champs
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Re: Allison won't go into gear
#1016329
10/13/06 11:43 AM
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Joined: Jul 2004
Posts: 369
jta75
OP
Angler
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OP
Angler
Joined: Jul 2004
Posts: 369 |
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Re: Allison won't go into gear
#1016330
10/13/06 04:55 PM
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Joined: May 2005
Posts: 8,909
fool4fishing
TFF Celebrity
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TFF Celebrity
Joined: May 2005
Posts: 8,909 |
Since it's an electronic control transmission, you should check all your fuses first off, battery voltage and charging.
F4F LIFE'S TOO SHORT TO FISH ONLY ON WEEKENDS!
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Re: Allison won't go into gear
#1016331
10/18/06 08:05 AM
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Joined: Sep 2006
Posts: 773
Codman
Pro Angler
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Pro Angler
Joined: Sep 2006
Posts: 773 |
The problem is that you just need a Chevy! LOL
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Re: Allison won't go into gear
#1016332
10/19/06 12:46 AM
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Joined: Mar 2003
Posts: 3,369
Bullet[BS]
TFF Team Angler
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TFF Team Angler
Joined: Mar 2003
Posts: 3,369 |
It sounds like you may a leak and there is not enough fluid in the transmission to engage the low clutches, double check your fluid level. Does Park hold? Give me a call during the day and let's talk about it. 512-353-5186 Bob Jett.
When in doubt SET THE HOOK! 
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Re: Allison won't go into gear
#1016333
10/19/06 01:42 AM
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Joined: Feb 2003
Posts: 55,499
SkeeterRonnie
Super Freak
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Super Freak
Joined: Feb 2003
Posts: 55,499 |
low battery voltage? check your battery terminals for corrosion between them and the battery.
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Re: Allison won't go into gear
#1016334
10/19/06 05:24 AM
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Joined: Mar 2003
Posts: 3,369
Bullet[BS]
TFF Team Angler
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TFF Team Angler
Joined: Mar 2003
Posts: 3,369 |
On the LCT-1000 series Allison and other GM transmissions Reverse & 1st gears are engaged by the manual valve moved by the shifter cable. If you have a problem with either gear it's either low on fluid, shifter cable, or a internal problem. I have seen first hand the transmission leak into the transfer case and start slipping. When you pull the fill plug on the transfer case it will be horribly overfilled. To fix that you pull the transfer case and replace the double lipped input shaft seal. Very easily done, give me a shout Jason I might know someone in your area that can help.
When in doubt SET THE HOOK!
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Re: Allison won't go into gear
#1016335
11/08/06 12:57 AM
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Joined: Dec 2004
Posts: 176
marcus10
Outdoorsman
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Outdoorsman
Joined: Dec 2004
Posts: 176 |
On an allison if it is an electronic problem with the valve body or prndl switch it will not go into reverse or forward. It is the only gm trans that will do this. All others will go into 1st or reverse with manual valve.
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Re: Allison won't go into gear
#1016336
11/08/06 12:59 AM
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Joined: Dec 2004
Posts: 176
marcus10
Outdoorsman
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Outdoorsman
Joined: Dec 2004
Posts: 176 |
If the shift indicator on the console flashes when it does this I could almost promise you that is the prndl switch on the side of trans. I have probably put a hundred on for this same thing. The tcm will have a trouble code stored.
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Re: Allison won't go into gear
#1016337
11/08/06 02:47 AM
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Joined: Jun 2006
Posts: 9,805
Yellowcat
TFF Celebrity
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TFF Celebrity
Joined: Jun 2006
Posts: 9,805 |
Originally posted by Codman_129:
The problem is that you just need a Chevy! LOL Cody You do know that chevy and GMC are just about the same thing. and that chevy and GMC both use the Duramax and the Allison tranny. 
Justin 63lb, 2 58lb, several 40's, 38lb, and several 20lb yellas. 
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