[Ligeia]

This is all way too much detailed information for me, but as I was stirring the spaghetti sauce, the term "Posi-traction" came to mind. That's what Chrysler called it then.

[brianl703]

Ok, posi-traction is a limited slip differential. Ford's name for it traction-lok, and my 1988 Mustang 5.0 has it although it's probably lost effectiveness due to mileage with 145,000 miles. When I get the differential gear ratios changed I will get the traction-lok rebuilt at the same time.

Limited slip differentials are very common on rear wheel drive vehicles, but not so common on front wheel drive (I guess the additional weight of the engine over the drive wheels reduces the need for it).