Called Lucas Oil a few minutes ago. They said their oil has the additive but just the bare minimum to qualify as PG-2 Limited Slip. They said it works great for newer gears but on old gears or older trucks or bigger diff.'s that extra additive can be added. The rep. their also told me to go ahead and put the whole bottle in, I asked if I could add too much and he said unless you add a unreal amount of additive you're fine.

 

My mistake, when I saw the "* for limited slip differentials add 8 oz", didn't realize it was only for the dana 60, 70 and 80.

 

2-1/2 qts. I think it was 75/90 synthetic 7 oz. Of modifier My diff is going great I put a new clutch pack in

 

Alright guys figured I'd come and respond. This has been solved. 4oz was the right amount for me. You can refer to post #21 for info on Lucas Oil having Limited Slip additive.