Why is my transmission shifting early

Asked by Steve6769 Dec 19, 2016 at 04:38 PM about the 1994 Chevrolet C/K 1500 WT LB RWD

Question type: Car Customization

I have a 1994 Chevy C1500 4.3 4l60e. I recently replaced engine with a 4.3
out of a 4x4 blazer 1995. Now my transmission shifts early and at low speed
jumps in and out of OD. I have replaced computer and put all elect.
components off my original engine on the 95 engine. Any suggestions?

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