Allison transmission shudder 4th to 5th gear! Any thoughts? - Chevy and GMC Duramax Diesel Forum
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post #1 of 2 (permalink) Old 01-25-2017, 08:58 PM Thread Starter
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Location: Alberta, Canada
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Allison transmission shudder 4th to 5th gear! Any thoughts?

Hey Guys. I'm having a bad shudder in the transmission when shifting from 4th to 5th gear only. Not happening all the time though and only occurs when driving on an incline, never on the flat. Some shudders appear worse then others even when driving on the same road. One day it was so bad that my little guy said "Dad I think the truck is going to blow up"!! So far I've counted 13 times that it has happened. The other issue is that the truck seems to surge ahead when downshifting to first gear just before coming to a complete stop. Again not all the time. Brought it to the dealer and they couldn't get the truck to duplicate my complaint and it wasn't tossing any codes. Of course the very next morning after I pick it up it would do it twice...unreal! They told me to keep an eye on it and pop back to the dealer so they can take another look. I hope this is not any indication of how this truck is going to be. Only 11,000 km on dash and I just got the truck back after 15 days for the steering gear pitman arm shaft. So disappointed right now. Anyone have any thoughts or ideas? Thx!

'17 Sierra 2500 Denali L5P ~ Summit White

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post #2 of 2 (permalink) Old 06-02-2019, 09:14 AM
Join Date: Aug 2010
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Big O...any luck figuring it out?....I have the same issue. I'm told it's a known issue with an UNKNOWN fix....something to do with Converter locking and unlocking. The general thought at my Repair shop is the TCM programming....Maybe an aftermarket TCM?
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