For 1993 & 94 4x4 1/2 ton trucks and such. Both 5.7 and 4.3 had the same TBI system, (although the S10 may have had a second EFI option, think it was 95) the injectors were bigger in the 5.7 but the throttle body measures the same and all parts on TB are interchangeable, the brain box it the same different chip for V8 and V6 the transmission was the same, some say the 4.3 tranny were a little weaker than the v8. The transfer case in the S10 is smaller in size, was popular for Astro van part-time 4x4, because of its size. The S10 4x4 transmission has the same 6 hole bolt up for the V8 transfer case, but check spline counts for sure, they should be the same. I have both of these truck in the back 40.