TH400 - Harsh 1-2 shift, smooth 2-3 shift

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GTME94

Full Access Member
Joined
Jan 20, 2013
Posts
441
Reaction score
31
Location
Metro Detroit/Holland, MI
First Name
Terry
Truck Year
86
Truck Model
C2500 C6P Camper Special
Engine Size
454/TH400/14bff 3.73
The Trans is the only thing not rebuilt when my dad went thru my truck.

1-2 shift is pretty harsh when accelerating or under load. It shifts smoother if I let off the gas.

2-3 shift is so smooth I can barely feel it regardless of throttle or load.

Is there an adjustment for 1-2 shift? Is my Trans going out?
 

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