
Allison harsh downshift
Customer just called me to schedule a service for next week and said he want me to look into his transmission concern as well. He has the allison 10 speed with 160k. Does a lot of over the road pulling with it. Anyways he is experiencing a very very harsh down... Login to read more. ![]()
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VIN | 1GT49WEY3L |
Engine | 6.6 L |
Trans | 1-speed Automatic (Electronic) |
Vehicle Data
2020 GMC Sierra 3500 HD Denali 6.6L
VIN | 1GT49WEY3L |
Engine | 6.6 L |
Trans | 1-speed Automatic (Electronic) |