Advanced YJ Jeep Wrangler Forum
I have a 94 YJ with the stock 2.5, and over all the thing is in great shape. I recently had the opportunity to pick up a 96 Sonoma 4.3 4x4 for a steal from a friend. Its frame is beyond rusted but powertrain is in fine shape.
I've seen a few videos and threads of people fitting 4.3s into YJs...