We picked up a complete 4.0L with an engine harness and computer from a ’96 Grand Cherokee on Craigslist and also sourced a used AX-15. The stock T-4 was a marginal tranny that wouldn’t bolt up to the 4.0L anyway. If we had to do it over again, we would have pulled the engine ourselves, as a lot of the fasteners and other stuff we needed were missing. As a result, we conservatively made 20 trips to the hardware store getting various bolts and fittings. We also did a quickie rebuild to the engine that was covered in a previous article. If you read that article, you know the rebuild ended up not going all that well.