Rxmfn7

iTrader: (4)

Hi guys, I just put a torsen LSD into my FC, and I was wondering what type of fluid to fill the rear diff up with. Will any 90W GL-5 fluid be ok, or is there a specific brand/weight that you guys prefer? Thanks.

apexkw

i have no clue on a fc but on my fd i use royal purple 75w90. i imagine its gotta be the same stuff though.

Rxmfn7

iTrader: (4)

Thanks, the reason I asked here is because FCs never came with a torsen LSD, we either got a clutch type, a viscous, or none at all. So I thought Id ask here since all FDs have a torsen.

Rxmfn7

iTrader: (4)

Anyone else have any more input on this??

cpa7man

iTrader: (2)

The main brands that most people use are:
Amsoil
Mobil 1
Redline
Royal Purple

This list is alphabetical and not in any order of preference. I believe they all come in 75/90. Some have a seperate MTL used for the 5-speed transmissions. Also they are all synthetics that should be from Group VI base stock. (this is a good thing)

I believe there is one other brand of gear lube that is recomended by racers but I can't seem to remember it.

I'm running Amsoil 75/90 in both my gear boxes. Next time I'm going to try Redline MT-90 in the tranny, and ROyal Purple 75/90 in the diff. Just for grins. I believe that all are great products....

EpitrochoidMan

Any decent gear lube should do it, synthetic is best. To really go overkill you could squirt in a bottle of friction modifier (like EquaTorque), that helps smooth things out, you can even use it in your MT with no ill effects.

EviLPeNeviL

iTrader: (2)

Yeah I'm using that exact combo right now in California for a few months now. It's a great deal of difference since I had no idea what the previous owner used or how frequently he changed it. RP is good ****.....

-Dan