Q: transmission problems on 1996 Chevrolet 1500 Pickup

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my 1991 chevy 1500 4 wheel drive is having problems shifting into second and third the fluid looks ok and full could this be a vacume problem
(1) Answer
(1) Comments
does it shift into second and third??

could be the governor and/or the gear.
could be a tps sensor or it could be internal.

the truck shifts hard into second and third at high rpms. where would the governor be located on the