Outer Limits 4x4 Board

this may be a stupid question,

but does it matter what oil i run in the rear diff of my sierra with a Detroit locker

please help

-Pyro

Yes it does matter , I was told by the guy who fitted my detroits not to run gear oil , but to run diff oil and yes there is a difference , he told me he would not warrant the detroits and centres if I used gear oil and no I'm not being smart , Cheers Paul.

does it matter what diff oil?
cos i know u need diffent oil for an LSD diff...

-Pyro

My diff bloke (who runs detroits himself) said to run a heavy gear oil - or that the std spec oil would be fine.

-Stu

when I had detroit front ran ls85-140 recomended from diff shop

I used 75% normal old diff oil with 25% moreys.. It did make a difference in the operation of the locker

what ever the car was designed to run from factory is what a detroit requires.
running something else may void the warrenty??

the running of heaver oil was to quiet them down abit. the new ones are alot quieter..

warranty is not an issue

the detoits are about 4 years old...

i just wanted to get a few ideas of what works best
the oile that came out of it had a bluey colour to it

that sounds like penrite limslip

there is no point running LSD oil in the detroit, just waste of money, LSD oil is friction modified for clutch type LSD's, so the oil dont burn..

any good diff oil will do, just dont leave it long between changes, my detroit likes new oil every 8 to 10 000 k's. it starts to get twitchy, probably wouldnt notice it in a long wheel base?

i use 85-140 in mine, and agree with changing it often

dogbreath_48 wrote:My diff bloke (who runs detroits himself) said to run a heavy gear oil - or that the std spec oil would be fine.

-Stu

Yep I have had detroits before, and still run them and I was always told to use straight 140, better on the R&P as well. I use Penrite comp oil and had no issues to date