Detroit locker posi unit??

The Power Lok posi is about the best. The next one would be the Eaton. They are clutch type, and almost as good as a Power Lok. Read the tags that come with the Eaton. Do NOT use synthetic oil, per Eaton. I've installed hundreds of them, and probably close to 1,000 Detroits, mostly in 9 inch Fords (stock cars).

Russ.