Torsen (the brand) has a lifetime warranty but if you try to exercise it more than once they start getting pretty rude. They were a very popular add on for the Mustang but folk that tracked their cars used to tear them up in pretty short order.

Quaife uses the Torsen basic design but has taken it to the next level, I haven't heard any reported failures from them yet.

How difficult is it to install an LSD (I searched and couldn't find anything)? Something I could attempt myself with average mechanical skill, or better to be left to a professional? I too am interested in an aftermarket LSD for my non-sport Z at some point down the road.

The actual installation procedure isn't that difficult but requires a few specialized tools. Adjusting of the backlash and checking the axle shaft's for run out is why you want a professional to do it. My race shop mechanic wouldn't even touch it, he referred me to a machine shop.

Could you elaborate on that?

Also I'm surprised to hear a clutch style differential would have less slippage, I thought that was the exact opposite. I'm not even sure how an LSD with gears could slip, I know they do though, I've seen it :facepalm:

I'm not very far away from you, if you take the plunge I would be very interested to hear where you went and your thoughts of the entire ordeal :D

Or maybe we can get a discount it we have two installed :tup:

It's not slip per-se, but a built in torque bias ratio.
Here is a white paper on how the torsen works.
The development of a differential for the improvement of traction control

Yeah being a machinist helps to put one in, i had to bust out the 2" indicator, the torque-angle gauge, and the last word, as well as some bluing to check mesh. At least you don't need a case spreader like certain domestic cars rear ends. definitly a precision job though and hope to hell your pinion height doesn't change or you're in for some more cash for bearings and a crush sleeve and more shims.

OK, now I get the Tobyharlem location!:roflpuke2: This probably won't happen for awhile (if at all) but I'll keep you posted. :tup:

You might as well have said I'd need a flux capacitor! I'm convinced...it will be a qualified shop that does the install if I take the leap :icon17:

I hear you, right now I'm just looking because I know I will want one. So we'll see how long the ol will power can hold out :rofl2:

I finally got to read this, good stuff :tup: