Several weeks ago i went and got another ford 9 inch chunk from an old 70's model ford pickup 2wd.i put it in the truck but couldnt use the 4wd cause the gears were wrong,today i pulled the chunk and put my old gears on.when i had it apart i found it had the ford limited slip unit on it. so basically i got a complete 9 inch rear with lsd for 50$ , i normally run detroits or lokrite lockers which don't require any special oils or additives etc. what additive do i put in this and how much. i've alrady put gear oil in it as i bought regular gear oil not knowing it had the limited slip unit in it. and the 9 inch doesnt have a drain plug.
Thanks John