the 3.4 has more advantages than just a bigger displacement. it's a superior block to the 2.8, with a better oiling design. :thumbsup: far less likely to blow a rod out the side. :yes:
finding a cheap used maybe wrecked Camaro and using the 3.4 and its fuel injection system can make a huge difference in your truck. But others will argue that you could also buy a wrecked XJ and do a complete swap to the 4.0L. choice is yours. but I would not put any time/effort into the 2.8L block. It's like the Dana 35 and the peugeot transmission. it's just not worth it. :(
If you have an auto trans, then you have a 904 trans. If you have a 5spd manual then it's a AX-5, if 4spd, then an AX-4.
You need to find out what gears you have now.