Hi guys I need to change my fluid in my diffs and I am wondering what synthetic to use. Also I know that I have limited slip in the read. do I have to get a friction modifier and if so do I have to buy it at the dealer? thanks guys.

 

Do a search, this subject has been beat to death and then some.

 

Valvoline, Mobil, Redline, Amsoil to start....
No friction modifier needed.

 

I have used Mobil1 75-90 meets the GL-5 spec. Has worked great.

 

LE-607

 

Mobil 1 75w90 - available everywhere, synthetic, and meets spec.

 

I just changed over to Royal Purple 75w-140. Very happy so far.

MikeyB

 

I used the DC stuff until the ring and pinion went south a while back. Been using Redline 75W140 with the new gears. I used friction modifier until the first change for break in purposes.

 

Like the trans, I use Redline in my truck and my cars too for that matter (although not the same Redline.... ) and always keep lots in stock.