Join Date: Jul 2016
DaveP is offline
Re: 2003 4x4 on 1991 2wd?
I researched the 2WD to 4X4 about 20 years ago. I had a 93 4-door that I had purchased new, had about 100K on it at the time, was in perfect condition and I wanted AWD. (Borg Warner full-time T-case like a Bravada). Xnke is correct: there is a LOT to know and do for this swap to be successful.
I discovered the "splice", and thought about sectioning the frames at the splice. But ended up purchasing a complete 4X4 frame with suspension, brakes, exhaust system (it's different too) from a theft-recovery ( no accident damage) 92 Blazer. Cost me $900 for the complete frame assembly, and by the time I was finished, about $4,000 for the complete swap. I drove that truck 290,000 miles total through 48 States and 3 countries. I used to say "I took a perfect car and made it better".
I was very pleased with my decision, and got 15 years out of it before I sold it. It is still in service. However, the truck was still "new" at the time, and good used and new parts were available in yards and from GM. No way would I consider doing it again today on a 25 year old vehicle, with only used-up 25 year old parts.
Do your research. There's a LOT to it.