What transmission will fit in a 1994gmc

Way back to 1991, original OBD, and even further back, cars came with specific engines & transmissions that had to remain the same, or electronics wouldn't work properly. So stay with what you have... Exactly. Long before 1990, you could put just about anything into a car and make it work because you didn't have computers..... I had a "63 Impala to play with. I bought a Corvette 327 that I converted from FI to dual-quads. Then swapped the Powerglide for a Turbo-hydromatic and got the rear end out of a heavier Chevy. Easy swaps, but that's not something you can do at all with newer cars.

Way back to 1991, original OBD, and even further back, cars came with specific engines & transmissions that had to remain the same, or electronics wouldn't work properly. So stay with what you have, Exactly. Long before 1990, you could put just about anything into a car and make it work because you didn't have computers. I had a 63 Impala to play with. I bought a Corvette 327 that I converted from FI to dual-quads. Then swapped the Powerglide for a Turbo hydromatic and got the rear end out of a heavier Chevy. Easy swaps, but that's not something you can do at all with newer cars.