I just scored a s4 lsd from the junkyard for $50!!! the cluster said 49K so im actualy pretty excited i wont have to rebuild it. heres my one question though. Has anyone used redline gear oil in their diff and which kind: mt90 or redline mtl.

 

i use the redline 75w90 LSD formulation... i forgot the name. It has a limited slip additive in it already for clutch type LDS's. MT-90 is for transmissions and is slightly different. You need to make sure the diff has the special LSD additive.

 

http://store.summitracing.com/partde...5&autoview=sku