Incorrect gear ratio on low gear
â–¶ How to fix
Contact an Allison dealer.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
The actual and calculated gear ratio do not correspond to low gear.
Possible cause
This is probably caused by a mechanical problem, for example a problem with clutches C1 and C6 for low gear.