My 94 chevy 1500 z71 dies when I put it in to drive and won't shift out of first to second unless I do it myself then won't shift out of second to third its fine in low gears but does in drive

Electronic switches sensors and solenoids on that one. they can be tested for codes to find clues, some have issue with the sensor that tells what gear-range. Then the speed sensor has to help calculate when to upshift, and the shift solenoids have to function for 1-2 and 2-d etc. If you are using newstuff for your electronics, the ecm can be part of your first tests. If you know you had to reinstall your old electrical parts, they can be the continuation of the problem. If the problem is new, and the ajustments are right? Perhaps your test parts for correction are still bolted to the old one. Hope this helps. the code reader is free to borrow at the parts store but know how comes from your trans builder/specialist.