EDIT: Requires all wheel drive
Well, the other day I had the idea to make an LSD that used plates (like many drift cars do). The advantage of this is that it's adjustable by tightening the three screws. I used the AWD ball differential, but I guess you could use one of the gear diffs with a little modification. This mod (if done with the ball diff), is fully reversable, if you don't like it.
The "plates" I used are three metal washers, you can see them in the pic below, here are the specifications:
-Width: 3/8"
-Thickness: 1/32"
-The interior diameter isn't very important, but it's 3/16"
I took out the middle peice of the diff, as well as the five ball bearings.
One of the most important steps is to use some good lubricant between all the plates. Otherwise it will be too tight, and will basicaly be a locked dif. I used
this lubricant.
These are all the peices I used: