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My 2002 D/A with 88,000 miles just started doing something unusual this week. It doesn't seem to want to shift into OD, especially when it's cold. It will eventually go into OD but not as fast as normal.
Other than this it shifts flawlessly. Truck 100% stock and has been babied its whole life and never pulled anything over 5000 lbs.
I'm due an oil change, Allison spin-on filter change and fuel filter change.
Ideas????
 

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It knows you are a Packer fan!:D

Just kidding. I am not sure about your truck/symtoms other than it may be cold/gelling. But am not sure. Hope you get it figured out and I'm sure someone that has been through this will chime in soon.

Best of luck,
Mark;)
 

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Not sure on the ally but the 4l80's wouldn't lockup in overdrive till the engine temp was above 165. I'd guess that's whats going on with yours. GB
 
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