I was just looking for differential options the other day. I found 2 readily available, and they appear to be variations on the same concept, being the Phantom grip, and that Engineered Performance, and while I don't have experience with either, the reviews I've read don't instill confidence...
I acknowledge that I am about 10 years too late on looking for this stuff, but as plentiful as 3800 variants are, you'd think there would still be options. I'd pay a grand for an essentially bolt- in torque biasing diff, as long as it was quality. Easier to stomach than the going price for a GMP chain set, if the prices I've seen are accurate.
