The computer chip (ROM) is located inside the ECU. This is located inside the truck behind the glove box on the right hand side. (89-91) Remove the bolts below the glove box that hold it in and pull that out. You will see the ECU as a silver colored box mounted up behind it there. Once you've removed the retaining bracket that holds the ECU in place you will see a small rectangular panel on the top of the ECU that is held on by two small screws/bolts, Your chip (ROM) is inside there. Be sure to remove the negative terminal from the battery before disconnecting the ECU or swapping out chips.
I don't think so, given that the engine became computer controlled in 1996. I they are the same size they might bolt up just fine but I'm not sure how much work it would be to convert it to computer control. The Suburban and Silverado drive trains were almost unchanged from 1988 thru 1995 and 1996 thru 2000.
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