Positraction Additive For Differential On A C3

[Ted Y]

I was wondering if anyone had a recommendation for what additive is required or recommended for my '70 posi differential. It says an additive is required and the shop manual gives a GM part #, but I wondered if there was anything comparable these days that someone would recommend.

[Desertdawg]

Some new choices

http://www.amsoil.com/storefront/ada.aspx

http://currieenterprises.com/cestore/produ...R2.aspx?id=1385

And the original

http://www.ecklers.com/product.asp?pf_id=A...amp;dept_id=121

I thought Royal Purple would have something but nope.

[anmracing2]

On the Plymouth, we use gear oil made for posi's but Amsoil is the second choice. It helps alot with cutting down on the clutch chatter with posi diff's......

Andrew