04-20-2025, 12:22 PM
A quick sanity check to see if it is actually changing gears assuming speed doesn’t change is to see if the tach jumps with the indicator change, If it doesn’t then the shift is not real. If it does then the Allison is actually shifting.
Do you have the jakes on when this happens? If so, turn them off and see if the problem persists.
The throttle position sensor could be flaking out on you telling the ECM to activate the jakes and downshift to 5th gear.
Do you have the jakes on when this happens? If so, turn them off and see if the problem persists.
The throttle position sensor could be flaking out on you telling the ECM to activate the jakes and downshift to 5th gear.
Richard and Rhonda Entrekin
95 Newell, 390 Ex caretaker
99 Newell, 512 Ex caretaker
07 Prevost Marathon, 1025
Maverick Hybrid Toad
Inverness, FL (when we're home
)