Re: Chevy S10 blazer Question froma newbie
Unfortunately, the 2.8 is a 60 degree V6 and the 4.3 is a 90 degree V6, so the transmissions and engine mounts are different. Swapping just the 4.3L onto the 5 speed can be done, though with a bellhousing from a V8 F-body(85-92)T-5. The engine mounts you may be able to just swap, I know the 2.8s used 3 bolts(not sure about the 4.3). The 5 speed will hold up behind the bigger engine, just be sure the clutch is in good shape and the slave cylinder doesn't leak, Oh and drive with some sense! Your other easy option is to put the 2.8/5 speed body onto the 4.3/autos frame(little more difficult, but worthwhile). Finally, the last option is to pull the engine and trans from the 4.3 and put it into the 2.8/5 speed one. Be advised the bellhousing bolts on the 4.3 are pretty hard to get out. The wiring for the engines should be pretty much identical, but the 4.3 uses a larger radiator, brake booster, cooling fan, and has the remote oil filter, etc. I planned a similar swap on an 85 with a 2.8/5speed using a 4.3L 4 barrel engine, but decided a complete drivetrain swap would be MUCH easier!
Also I believe the 2.8 ones had a smaller rear axle(maybe not though?)
1989 GMC S-15 4x4 4.3L/700R-4, 3.08s, 31" Sport Kings For Sale
1985 S-10 4x4 Soon to have 3504BM/TH350/D44/14FF, 35" Boggers