Originally Posted by TireIron
for a limited slip you can't beat a detroit truetrac. It is a full geared limited slip with no clutch packs to ever wear out or have to rebuild. Keep in mind that with a limited slip it is going to need to be installed by someone who knows how to setup the backlash on the gears after intall because it replaces the carrier.
I finally bit the bullet and got a truetrac installed last weekend in my 7.5" rear end. Can't feel any difference on the street, its basically invisible except my tires don't spin on wet roads anymore. I tried it out on a dirt road and if I really jam the gas both tires spin equally. So it really works! I read on another site that it is engaged a little all the time, and it seems like its true because there is no clunk or hesitation.
I was attracted to the truetrac because like TireIron says above it has no clutches to replace and I had a stock Ford LS in a previous truck wear out before 100K. And the truetrac doesn't require any special oil additives or anything. It costs more than the ford one and about the same as the auburn pro, but installation costs the same for all of them. The only one that is cheaper to install is the Powertrax no slip but they don't make one for a 7.5. And its not supposed to be as smooth.
The guy who installed it only charged 3 hours labor. He was easy to choose--out of all the shops around he was the only one who had done it before. He didn't have to take out the ring/pinion so didn't change the pinion seal or anything, but he did need new bearings for the limited slip because he broke one swapping it off the open diff. All told the unit cost me $475 for the part (delivered) and $215 to have it installed (with parts and oil).
Can't wait to try it in the snow and camping in the spring!!