ok I bought some castrol hypoy C gear oil (the stuff that HTKYSA recomends) but is this ok for the LSD? it says it is but I wanted to make sure

bump does anybody kmow? if not what do you guys use?

Yup, dat's what I use. Are you changing the fluid? If so, then U need to add that LSD additive: Posi-trac or somthing to that name. Said it was for Posi and LSD.

cool any idea where I can get that stuff at?

Local auto parts stores.....

oh god I hate those guys.

On my 81 Subaru, I didn't like that the transmission always seemed hard to shift for the first few minutes/miles that I drove. I assume this was because the 80/90 weight conventional gear oil doesn't work that well when it is cold.

 

Several years ago I switched to Red Line synthetic oil, aka Shockproof Gear oil. It's rated at 75W to 250W! I noticed that shifting when the car was cold was definitely easier. The stuff is actually red in color. I didn't put it in the back axle, just in the front wheel drive transmission.

 

The stuff is quite expensive, really expensive, I forget what it cost but I haven't replaced the stuff in several years and it still seems fine.

 

At 190,000 miles I had the transmission rebuilt. Shortly thereafter is when I think I switched to the Red line synethic oil. My car now has 256,000 miles and I can actually burn rubber on my front wheel drive only subaru wagon.