what about the silicone ?
Best Posi Additive ?
Thread Starter
Racer
Joined: Mar 2005
Posts: 306
Likes: 0
From: WAY SOUTH OF HEAVEN inebriated
Best Posi Additive ?
Im almost ready to mount the diff to diff carrier and im wondering what would be the best additive to put in and whats the best gear oil?also should i use silicone on gasket prior to installation ? 
thanks muchly! 
thanks muchly!
Intermediate
Joined: Mar 2005
Posts: 31
Likes: 0
I highly reccomend Red Line Oil... it's a great quality synthetic oil, so it'll maintain it's properties for a longer time than a natural oil, and it really does lubricate well. It's a little bit more expesive than a natural oil (about $20 for your rear diff), but I think you'll be happy in the end. Just make sure to get the one for limited slip rear ends, and if you want it a little tighter, mix some of the NS designated of of the same weight in. You can get it from Summit, or some local auto-part stores might carry it.
I've got it in my truck diff and tranny, and plan on using it when I get to that point on my Corvette rebuild that I'm working on currently.
I've got it in my truck diff and tranny, and plan on using it when I get to that point on my Corvette rebuild that I'm working on currently.
Last edited by eddiemeddiem; Jun 12, 2005 at 05:42 PM.
Le Mans Master
Joined: Oct 2002
Posts: 5,714
Likes: 6
From: Silver City NM
St. Jude Donor '05-'07
Originally Posted by paul67
Don't second guess GM. It used to be sperm whale oil but they have a modern equivalent.
I use STP...it's the RACER'S EDGE!!!
Dep
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Racer
Joined: Apr 2001
Posts: 391
Likes: 1
From: Bend, Oregon
Some gear set companys do not recommend synthetic gear oil. When I rebuilt mine with new gears and an Auburn posi unit, they didi not recommend syn. but to use a good 80-90 dino oil with 6 ounces of GM additive, then after 500 miles, suck out the old gear oil and replace.
Garson
Garson
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
Originally Posted by Eddie 70
I used GM additive and Mobil 1 sythetic in mine.
Exactly what I have been running for over 2 years - Mobil 1 and a bottle of GM Posi FLuid (2 bottles is overkill IMHO).
Instructor
Joined: Feb 2005
Posts: 153
Likes: 1
From: Monroe MI
When I did the 12 Bolt in my Chevelle I used AMSOIL which required no additives. I even called them to verify it, not sure if it was a synthetic or not. Drove the car for almost 3 years before I sold it with some pretty good abuse and never gave me any problems.
