Automatic trans shifting problem

Asked by May 06, 2014 at 08:14 PM about the Chevrolet Silverado 1500

Question type: General

I recently replaced my engine in my 94 1500 automatic 4x4 silverado. I had a good
running 88 350  basically the same as the original. It runs great but the problem is it try's
to shift too quick when I accelerate then it has to shift back down so back and fourth it
does that. I found out the 94 trans shifts by computer but the older 88 model didn't. I
didn't nt put the 94 manifold back on the 88 that I installed in my truck. So what can the
problem be and  how to solve it. My original engine with the correct manifold is gone so I
can't use that. I don't understand what sends the signal to the trans when to shift since it
doesn't have the same  linkage as the 88. I do notice there is another plug in in the
harness down close to where the main harness plugs into the transmission. Does
anybody have any advice. Thanks lots  Jim

1 Answer

16,235

the trans uses the TPS to control shifts as well as the speed sensor. The TPS should be on the throttle body

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