This is what a Mustang Trac-loc limited slip looks like. Factory on all 83 up V8 mustangs. This is a pic of a 8.8" unit, from a 86 up Mustang. It uses a set of clutches on each side of the spider gears and gets preload from the s-spring. There are alternating clutch plates and metal plates to create friction and lock the wheels. Similar to most other limited slips like the GM Posi unit, and the Mopar Sure-Grip. For added grip, you add extra clutches, one on each side to make more preload. My friend got 1.42 60ft's with his. The only downside is the strength of the stock differential case itself, which is inly good for so much power. There are differentials like the Quaife, called Torsen differentials. They are not recomended for drag use though. They are THE best for road course use though, because they are torque-sensing. Saleen uses them I believe as an option. So really, the PG is not a "fake" limited slip. A Quaife is more than a limited slip, it's a torque sensing gear differential. No clutches invloved.

Complete assembled diff.



Here is complete clutch pack for one side, the ones with tabs are the clutches, the other are the metals


Here they are all laid out, this is the stock order, you can also alternate them for better grab.

'00 Harley-Davidson F150
'88 Mustang GT
'93 Mustang LX 5.0
'00 Focus (beater)