12 bolt corp limited slip

[supernaut]

I am going replace the diff oil in my stock front dana 44 and stock rear limited slip 12 bolt corporate. My manual doesn't seem to say anything about what oil to add to the stock limited slip....'75 k5 w/stock axles. I've read there is an additive you need to put in with the regular gear oil. Anyone know if that's the case?

I'm planning on cleaning out the diffs of all old gear oil and metal debris, etc and putting in synthetic 75w90...

 

[resurrected_jimmy]

Friction disk limited slips need a friction modifier, you can get it in a small tube at most parts stores