Differential lube
Thread Starter
Drifting
Joined: Jan 2006
Posts: 1,726
Likes: 97
From: Castro Valley State of Insanity
Differential lube
New C-5 owner with a question. Since the 6speed trans and differential are mated to each other, do they share the same lube, or are they sealed from each other and use different types of lube, thanks, Larry.
Melting Slicks
Joined: Nov 2002
Posts: 2,884
Likes: 260
From: Jamison Pa
St. Jude Donor '11-'25
Rear/Trans Lubes
Trans/Rear lubes are different. They do not share a common lune supply.
I'm changing my rear out and plan on using Royal Purple in the trans and rear.
Bob K.
I'm changing my rear out and plan on using Royal Purple in the trans and rear.
Bob K.
Race Director
Joined: Jul 2004
Posts: 16,794
Likes: 62
From: Lake Havasu City, AZ
The six speed box (Tremec) takes Dexron III ATF
Mobil 1 or royal Purple or Red Line are popular
The rear diff takes 75W90 synthetic gear oil.
Again pick your favorite brand. I add the GM posi fluid regardless of the brand of Gear oil I use.
Mobil 1 or royal Purple or Red Line are popular
The rear diff takes 75W90 synthetic gear oil.
Again pick your favorite brand. I add the GM posi fluid regardless of the brand of Gear oil I use.
Drifting
Joined: Mar 1999
Posts: 1,250
Likes: 1
From: Greensboro NC
I always play it safe here. I only use the factory fluid with additive and change it every 15,000 miles since it only takes about 5 minutes to change with the car sitting on its own wheels in the garage.
One problem wiht the factory fill is the fact that a lot of the diffs are overfilled by 5 oz. or more. Mine was leaking out of the breather on top, so I checked it warm and on a level surface. Drained 5 oz. out before it was level with the bottom of the hole. I wonder if overfilling also has an impact on the actual leaks developing on the radila seal and case gasket??
One problem wiht the factory fill is the fact that a lot of the diffs are overfilled by 5 oz. or more. Mine was leaking out of the breather on top, so I checked it warm and on a level surface. Drained 5 oz. out before it was level with the bottom of the hole. I wonder if overfilling also has an impact on the actual leaks developing on the radila seal and case gasket??
Last edited by Alex D; Jan 22, 2006 at 11:40 AM.
