Recently I swapped in a 98 4.3 into my 94 C1500. I cannot answer all your questions but I do have a couple of answers. The dash harness will need to be custom built. The old 94 dash relied on analog devices to report the temps, speed etc. The 98 sends most of this info to the PCM then digitally...
I shall answer my own question. Turns out that most pickups with the tilt steering column have a safety (so to speak) switch built right in. The key will not turn completely unless the lever is in park or neutral. I had not hooked the column back up to the linkage and tranny. Once I did and...
So I have this little shortbox black c1500 that I bought new in 94. Now after over 400 thousand the engine started making a god awful knock/bang (connecting rods on the way out) noise. Not a problem since I have a low mileage 98 in my back yard that a friend wrapped around a telephone pole just...