How much additive?
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
Originally Posted by MAC74
I am just about to put my new rear diff in and I was wondering how much additive to put in with the gear lube?Also what type of gear lube should I use?
I use Mobil1 and I really like it - but that can turn into a thread on it's own... and has many times!
Burning Brakes
Joined: Oct 2001
Posts: 896
Likes: 1
From: Thomasville, home of the Big Chair NC
I just changed mine in the 82 yesterday.
1 bottle of additive and 3 1/2 bottles of GM 80-90 wt.
You can add an extra bottle of addtive if you want to.
Get you a suction gun and go at it.
I put the additive in first and then the lube.
I make a few slow figure 8's to get everything lubed up good.
I am sure there is a bunch on here about exactly how to do it.
Thats just my .02
I also changed my rear end snubber bushing. that is a different story altogether.!
1 bottle of additive and 3 1/2 bottles of GM 80-90 wt.
You can add an extra bottle of addtive if you want to.
Get you a suction gun and go at it.
I put the additive in first and then the lube.
I make a few slow figure 8's to get everything lubed up good.
I am sure there is a bunch on here about exactly how to do it.
Thats just my .02
I also changed my rear end snubber bushing. that is a different story altogether.!
Pro
Joined: Apr 2004
Posts: 687
Likes: 0
From: Atascadero Ca
Is the "limited slip" additive that kragen sells any good? I drained mine (origional fluid after 30+ years) and put in 1 bottle of the limited slip additive and topped it off with fresh fluid. It still whines at 60mph. Goes away by 70mph. Think i should drain and refill with a couple genuine gm bottles?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
Originally Posted by i885744
Is the "limited slip" additive that kragen sells any good? I drained mine (origional fluid after 30+ years) and put in 1 bottle of the limited slip additive and topped it off with fresh fluid. It still whines at 60mph. Goes away by 70mph. Think i should drain and refill with a couple genuine gm bottles?
Replacing the fluid might help the whine. I found that the Mobil1 quiets gears down better than dino oil.
Team Owner
Joined: Sep 2003
Posts: 88,393
Likes: 2
From: eville in
Originally Posted by i885744
Is the "limited slip" additive that kragen sells any good? I drained mine (origional fluid after 30+ years) and put in 1 bottle of the limited slip additive and topped it off with fresh fluid. It still whines at 60mph. Goes away by 70mph. Think i should drain and refill with a couple genuine gm bottles?
