We've got a 1990 YJ Wrangler(2J4FY19P4MJ____) that came to us with a broken 5 speed tranny and a questionable rebuilt 4 cyl. My son drove a 4 cyl Wrangler on a used car lot and found it to be a major Wimp from a performance standpoint. Rather than throwing $ and labor into getting the 4cylmotor...