Join Date: Jan 2003
Location: Escondido, California
Yes it is true that the Detroit Truetrac is only available for the Dana 35c in a 27 spline version.
If you buy the true Super 35 kit from Superior Axle, it comes with a choice of full case 30 spline lockers including ARB Air Locker, Detroit Locker, and I think now the E-Locker from Eaton too. So there is no Truetrac or other limited slip differential option for the 30 spline Super 35 kit. Caution that there are a few "fake" Super 35 kits that copied Superior Axle's Super 35 name that include slightly stronger 27 spline axle shafts but I would avoid them as not worth the $$$ or effort needed to install them.
Your Dana 35c's axle housing (aka pumpkin) is fine for 4.88 gearing as is, though depending on what ratio you have now, you may need front and/or rear gear carriers (aka cases) that go inside the pumpkin. The carrier sells for $60-70 and is what holds the spider gears and also what the ring gear bolts to.
HOWEVER, if you want a stronger rear axle and a Detroit Truetrac, you can go with Superior Axle's C-Clip Eliminator Kit which allows the use of a 27 spline Detroit Truetrac while giving your rear axle substantial more strength. Its track record is such that I don't think anyone has come close to breaking one yet, from what I hear.
When you have a choice, buy American made.
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