Yaay! A subject I actually know a bit about! Wrangler Jeeps are built on the same essential frame that was used in the 70s CJ series. Now, due to the use of Chrysler transmission, you can bolt almost any Mopar engine on earth to your current bellhousing. However, if you want to go GM, you can use the transmission from an AMC jeep and it will accept a GM block. OR, you can bolt in a T350, make a custom shifter and it will work. OR if you want to go ford.... Jeeps are very compatable vehicles. There are a few questions you may want to ask before you do your job. #1, do you want 4wheel drive? #2 how much do you want to spend and #3 How much HP are you going to push through your drivetrain? When you have your answers to them, youll be well on your way