I have one. It is actually an 8.0 NOT an 8.8.
The shape is similar, but not exactly the same as a T-Bird, Cougar, Lincoln IRS.
It is an open dif., not limited slip, and the bearing caps look very light duty.
It did appear that an 8.8 LSD "might" bolt into it. The bolt pattern for the cover is the same as an 8.8.
I would not be tempted to use it.........even if I got it for free.