Rear Diff breather leak after gear install

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07-08-2009, 10:00 AM

#21

06stangGT

4th Gear Member

Thread Starter

Join Date: Jan 2006

Location: NY

Posts: 1,061

Quote:

Originally Posted by rls82959

I would just remove the fill plug and see if it drains out there. If it's over filled, fluid will come out of the fill plug. That should be sufficient. I filled mine to the bottom of the fill plug with Royal Purple 75W-140.

I filled it with whatever royal purple I bought from brenspeed when i bought the gears. The fill plug has been off to check the level and the fluid does not come out. I am going to check it again this afternoon when I get it up on the lift

07-08-2009, 01:07 PM

#22

tx_zstang

5th Gear Member

Join Date: May 2007

Location: Central Texas

Posts: 2,388

Quote:

Originally Posted by ShadyNinja

You guys know the S197 calls for a heavier Fluid right?
its not 75w90
the mustang calls for synthetic only
also it takes a heavier lube than your truck

it uses the 3rd one down

http://www.amsoil.com/a/synthetic-gear-oil?zo=1667299

The V6 manual calls for 75W90.
My chevy truck says to use 75w90, too.

I prefer to go with 75w140 though for the abuse I put them through.