Dif fluid?

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Aug 25, 2009 | 03:34 PM

saber

Thread Starter

Burning Brakes

Joined: Aug 2002

Posts: 826

Likes: 29

From: Bonita Springs, FL

Dif fluid?

Just recently got a 75 with posi and am changing fluids.
What do I put in the dif?
Thanks in advance

Aug 25, 2009 | 04:11 PM

FKING1

Safety Car

Joined: May 2003

Posts: 3,814

Likes: 105

From: Dearborn Heights Michigan

I put NAPA 75/90 in my 70 and make sure to put in additive for the posi.

Aug 25, 2009 | 04:18 PM

crvtownr

Racer

Joined: May 2009

Posts: 295

Likes: 2

From: Columbus OH

I use 85/140 Lucas Oil based on a recommendation from gtr1999 (Gary) the ultimate authority on differentials.

Quote:

Originally Posted by FKING1

make sure to put in additive for the posi.

GM posi additive is a must.

Aug 25, 2009 | 11:42 PM

Z-man

Race Director

Joined: Nov 1999

Posts: 10,643

Likes: 8

From: Foxfield CO 1970 Convertible

Did anyone mention that, regardless of the oil you use, don't forget to add the little bottle of positraction fluid...

Aug 26, 2009 | 01:11 PM

C3 4ME

Le Mans Master

Joined: Oct 2005

Posts: 6,247

Likes: 471

From: Glen Allen, VA

I just did this night before last. As suggested, I put the GM posi additive and Lucas Oil gear oil. Mine used to clunk and make all kinds of noise. After a short drive, all is quiet, but I havent' taken it on a long drive yet. Heading to Carlisle this weeekend, so I'll know for sure if it worked then.

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