Allison 5sp: 2005 Duramax/5 speed Allison shift issues

[Draper788]

Allison 5sp: 2005 Duramax/5 speed Allison shift issues Edit Post

Edited to make shorter. 2005 Chevrolet 2500HD 2wd Durmax w/ 5 speed Allison bone stock truck w/ 110K miles. Issue is out of the blue one morning I got hard neutral style shifts, no codes (see attached pic), transmission fluid level is good, already changed the NSBU box and ignition switch and issue is still occurring randomly. Can restart the truck a few times and the problem goes away but will come back randomly.

 

[torqued2dmax]

Did this start right after the fluid and filter change ? What fluid and filter did you use ?

 

[Mike L.]

My attention span it way too short to read that whole post.
In the future; keep the post short and to the point with codes. Let us guys extract info to help you as we need it.

 

[zakkb787]

Mike basically he's had issues with random hard shifts and he will restart the truck and it'll be fine. Stock truck. New nsbu switch and ignition switch and still same problem. No codes. I got bored last night and read it all :roflmao:

 

[IOWA LLY]

Check and clean grounds, make sure both batteries are good, try a different TCM.


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