Allison 6sp: 5-6 gear shift

AubleAK

New member
Aug 5, 2011
781
0
0
30
Glennallen, AK
My boss was saying in his 5th to 6th gear shift it feels like hes riding a rumble strip. Vibrates and such. Truck has no tuner currently, but previously did have h&s on it. Any ideas?