Buick Spec #723

[Weldar]

Service manuals call for Special Lube Spec #723 for use in the posi rear ends. Anybody know what an appropriate replacement would be?

Dwaine

[WkillGS]

A name brand gear oil with a bottle of posi additive from your local GM dealer should do it.

For expert advice, check the forum here:
http://www.jdrace.com/

Jim Monzaz runs the site and known the GM rears better than I ever will.
Please report back with your findings!

[Loren At 65GS]

I agree with Walt. I used the same as he suggests in my GS.
When I had my Ford 1 ton serviced, the dealer didn't have the Ford additive in stock, so they used another brand. It caused a chatter in the rear when turning. I changed it to the Ford additive , chatter gone.
I incurred the same thing with a Blazer I had. Made the mistake of using a non GM additive. Again chatter untill I corrected it with the GM additive.
Like Walt suggested, use a top quality gear lube and the GM additive.

Loren

[Weldar]

A name brand gear oil with a bottle of posi additive from your local GM dealer should do it.

For expert advice, check the forum here:
http://www.jdrace.com/

Jim Monzaz runs the site and known the GM rears better than I ever will.
Please report back with your findings!

Checked the forum over on jdrace and see the same recommendation, also called the local GM dealer and let the service manager know what I was looking for and they also recommend the GM gear lube with the limited slip additive. Sounds good.

Dwaine