tell me why ...i just found out after 10yrs
 

Tell me why when i was changing my cover on my rear differential which was rebuilt like 10yrs ago ..i decided to look at the Post unit and found out it was a lsd eaton 19559-1 ...ALl these years I've been thinking they replaced it with oem...g80... so now my question is since i found out it was a LSD unit.. IM going to need the additive correct? And what size Oil? do i stick to the 75w90?

What fluid have you been running for the last ten years?

Shit ... i dont know... and i dont have the work order no morr...and the shop i took it to isnt there anymore 😭

Yes you will need the additive. And yes 75W-90 is fine.

Sorry, can't tell you "why". ;)

Im running Lucas 75-90 in mine with no additive and it's fine.

I'm running Lucas 75-90 in mine with no additive and no issues.