Your stock diff is a Dana30. If the front shaft seems to come from the upper part of the diff, it is a high pinion (HP). This allows better clearance and less strain on your drive shaft (also less vibration). You can also find old Dana 44 and Dana 60 front diffs, but your problem is your ring and pinion gears.
A dana 30 can take deeper ring and pinion gears (up to 5.10 ) but you rear diff is probably a chrys 8.25 so that limits your depth to 4.56. Both front and rear diffs have to be running the same size ring and pinion gears. With 35" tires you should be running the 4.56. If you're not trying to get air as you go over objects in your off roading the Dana 30 is a good choice. If you can't keep your foot of the skinny pedal go for a 44, but it will have to be reverse cut to give you a high pinion set up.
Wednesday, October 13th, 2010 AT 6:21 PM