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Discussion Starter #1
'04 LB7 Duramax w/ Allison
After changing my tranny fluid and spin on filter my transmission shifts very inconsistant. Sometimes the engine revs between shifts as if it's slipping, sometime it shifts perfect, and most of the time it shifts hard, mostly during downshifts. Reverse sometime hesitates then engages hard.
None of these problems were present prior to my changing the fluid. Tnhey were present immediatly afterwards. I've check the Hot level multiple time while running with tranny at 150 F and it looks fine.
Any ideas as to what might be causing this?
 

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Hey,
My Ally did the same and ran HOT all the time no matter time of day or type of driving (highway/city).

Ralph (05 2500hd) and Pat (McRat) resetted my TAPS and now its all back to normal. I cant explain it but it worked for me. Get together with someone who has a Tech 2 and knows how to reset the TAPS and do a fast relearn.
 

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Discussion Starter #3
After a couple more days mine has finally smoothed out. I suppose the values for the adaptive tranny must have gotten off? Very weird that a fluid change would cause this.
 
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