Automatic trans shifting problem
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