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Scrufdog 03-28-2006, 10:35 PM So everyone always talks about what rear they have, even me, with my 14 bolt. But what about the front diff? I never see too much discussion about the models and types used in the trucks. Any source for good info about them? bcserl 03-29-2006, 03:44 PM For 1989 up to present 3500 have a GM IFS 9.25" dia. RG 34.8 (1.37") shaft, 33 spline. Not sure about the 2500 but I expect it would be the same. dmax4u2nv 03-29-2006, 04:16 PM correct. they are the same qwomack 04-27-2006, 11:26 AM What about 1500 series? ockgator 04-27-2006, 06:49 PM 1500 uses 8.5" ring gear IFS mt-max 04-28-2006, 11:50 PM For 1989 up to present 3500 have a GM IFS 9.25" dia. RG 34.8 (1.37") shaft, 33 spline. Not sure about the 2500 but I expect it would be the same. Unless, it was a V3500 crewcab, then they had a solid Dana 60 up front through 1991. Cheers. I Love Grits 05-04-2006, 12:39 AM 1500 uses 8.25 Ring gear, 8.5 is the Old Body Style rear with the 8.625 being the New Body Style Rear mgmack 06-01-2006, 08:32 AM Is the front diff open, a limited slip, or a locker on the 04 2500HD? _MJB_ 06-01-2006, 09:23 AM The front diffs are open on all the IFS trucks as far as I know. With the central axle disconnect system they use to disengage the front axle, the spider gears in the front differential are turning whenever you are in 2 wheel drive. I believe the only type of locking differential that will work in this type of setup is some type of electric or pneumatic actuated locker. | ||