235/75/R15 is a stock tire so i would say he has stock gears. with a six in that thing it should have some pep in its step. have you tried a tune up? like all new plugs ,wires,rotor and cap? if you have a ohm meter you might try checkin your coil see if its puttin out like it should. sea foam worked wounders on my performance. as for the chip i cant make up my mind if i want to try it . to many mixed opinons on it. but since dude found one on ebay for 30 bucks im going to ebay and see if i can get lucky. if it dont work i'll just put it in the pile of other crap i bought that didn't do shit but gave me some quality wrenchin time with my jeep.