Mike, I took the 318 out of my mothers Ramcharger, and inserted a 4bta. Runs every bit as good as the 318 EVER did, and get 32mpg. The Cat I had considdered for the swap before deciding on the 4b was a 3054. Adelman's usually has new ones for a decent price, but for the cost of adapting it... The Cummins is an easy swap. Get the flywheel housing from a 6b Ram, and a pre-2000 trans from a diesel 2500 (no computer). And if you get the 4wd version, TC mount is a Texas patern, and the origional should bolt to it. The man I got the trans from did a f250 that smoked the tires the full length of his shop(40+ feet) and got 30mpg. The little engine can be turned up a good bit. If you look on the Yahoo 4b group there are a few guys who have turned theirs up to over 500hp. The seem to be reliable at that level, too.