Allison Tran
I have erratic shifting with my 8.1 Allison 1000 tran. 50mph and above my tack shows 2200 to 2500 up and down from my tran shifting. Any one else every had this problem with this Allison 1000 tran.
Forum Discussion
Yup, turn off overdrive when it does that.. This can happen if you are towing and hit just the right combo of grade and weight and headwind and such.
Also, the suggestion of routine service is a good one.
Also, the suggestion of routine service is a good one.
