Duramax Diesels Forum Truck of the Week
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Old 06-29-2018, 05:51 AM
buster4114 buster4114 is offline
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Default Transmission problem

Hello, I am new at this hopefully I'm in the right spot. I have a 2005 GMC with 1000pk transmission. I've been too three different shops over $1,200 and still not fixed. It drives fine for the first maybe 15-20 minutes or more or less. And then you go to slow down it clunks and will not shift. And when you put it in park or move the shifter to neutral. It clunks and the driveshaft looks like moves back and forth. Turn the key off for a few seconds start it back up and it is fine until you drive it again for a little while then it acts up again. Any suggestions would be greatly appreciated thank you.
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Old 06-29-2018, 06:44 AM
Bdsankey Bdsankey is online now
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Originally Posted by buster4114 View Post
Hello, I am new at this hopefully I'm in the right spot. I have a 2005 GMC with 1000pk transmission. I've been too three different shops over $1,200 and still not fixed. It drives fine for the first maybe 15-20 minutes or more or less. And then you go to slow down it clunks and will not shift. And when you put it in park or move the shifter to neutral. It clunks and the driveshaft looks like moves back and forth. Turn the key off for a few seconds start it back up and it is fine until you drive it again for a little while then it acts up again. Any suggestions would be greatly appreciated thank you.
Do you have a way to pull codes? If an Allison is doing weird things there is a very high probability it has codes for it, they are crazy smart.
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Old 06-29-2018, 07:07 AM
buster4114 buster4114 is offline
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I could take it to autozone
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Old 06-29-2018, 07:48 AM
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You’ll need a better scan tool than what autozone has.
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Old 06-29-2018, 07:56 AM
buster4114 buster4114 is offline
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Ok thanks,What kind of scan tool?I will buy one
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Old 06-29-2018, 08:17 AM
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Tech2, EFI live, or an upper end otc/snap on scan tool. these are not cheap...
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Old 06-29-2018, 08:25 AM
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Ok thanks,What kind of scan tool?I will buy one
This sounds like a job for a real Allison tech honestly. It will be cheaper in the long run. Where are you located?

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Old 06-29-2018, 08:34 AM
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Youíll need a better scan tool than what autozone has.
You might be surprised. I've got a cheap actron pocket scanner(9145 I think), and it WILL read tcm codes. I know most cheapy's won't, but actron seems to, and all the AZ's I've been to used actron. So you can try it, but if all you get is a p0700 and no other codes, then you need a better scanner.
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Old 06-29-2018, 08:41 AM
buster4114 buster4114 is offline
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I am located in Napoleon Ohio, the first shop I took it to. They said they did some testing on the valve body and everything tested okay so they took the valve body off and soaked it and put it back on charge me over $600. The second shop by took it to a pressure switch and wiring harness. Charge me around 400. The third shop I took it to put a neutral safety switch on it.
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Old 06-29-2018, 09:40 AM
gmac32 gmac32 is offline
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You can run it to me but it is a little bit of a drive
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Old 06-29-2018, 09:49 AM
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Originally Posted by buster4114 View Post
I am located in Napoleon Ohio, the first shop I took it to. They said they did some testing on the valve body and everything tested okay so they took the valve body off and soaked it and put it back on charge me over $600. The second shop by took it to a pressure switch and wiring harness. Charge me around 400. The third shop I took it to put a neutral safety switch on it.
Could be a wiring issue I sent you a pm
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Old 06-29-2018, 07:49 PM
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I had issues out of mine. Wouldn't shift right and throwing several codes. Range inhibit lights kept coming on. With a new one by the way. I bumped with my fist the tcm on the radiator connection and it quit instantly . This was 200 miles from home camping. Got it home and unplugged tcm and added dialectical grease never had a problem since. I would start with that.

Last edited by duramax on fire; 06-29-2018 at 08:07 PM.
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Old 06-29-2018, 09:06 PM
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Default Transmission problem

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Originally Posted by buster4114 View Post
I am located in Napoleon Ohio, the first shop I took it to. They said they did some testing on the valve body and everything tested okay so they took the valve body off and soaked it and put it back on charge me over $600. The second shop by took it to a pressure switch and wiring harness. Charge me around 400. The third shop I took it to put a neutral safety switch on it.
Soaking the vb. Thatís a new one lol.

Thatís how you fix stuff right? Windmill parts at it till it maybe goes lol. Some shops should be shutdown.

I dunno if Danville builds trannyís or not but they are only 4 hrs or so from you. At least they arenít retarded. Limitless is 10 hrs the opposite direction but I guarantee they will sort you out.
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Old 06-30-2018, 04:22 AM
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I've had a couple bigger allisons at work have similar issues due to output speed sensors or speed sensor wiring. It I have allison software to read them there.

You need to take it to a legit place though that can read the codes. Thought there were a few decent shops in Ohio I'll have to dig in my memory bank though..lol
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Old 06-30-2018, 04:38 AM
Blackmax123 Blackmax123 is offline
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I believe Crank it up diesel was up in your neck of the woods. His website seems behind but I'm pretty sure he's still pulling.
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2008 Chevrolet 3500hd duramax ltz cc/lb dually (homemade handgrenade) built motor by me, Built tranny by me, big exergy pump and s&s over it, large exergy lbz injectors, ac delete, custom Danville s400 true 2.5 charger, roll pan, 8" single stack, custom hitch and a few more pulling goodies.

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