Rear Differential Drain
Race Director
Joined: Jun 2004
Posts: 13,956
Likes: 706
From: WI
I believe the stink in gear lube is sulfur which can turn to sulfuric acid. I have read some FSM say not to change it and some state 100,000 miles. If your car still has the original, just change it.
I use Redline heavy shock proof, I still have the original D36 and it still leaves posi marks. You can check break away torque by turning the spindle nut with one side off the ground.
I've been planning to add a drain since I change mine fairly often. I put on a lot of track miles! Getting it tested isn't a bad idea but I like to learn things so it would be cool to me to know.
I use Redline heavy shock proof, I still have the original D36 and it still leaves posi marks. You can check break away torque by turning the spindle nut with one side off the ground.
I've been planning to add a drain since I change mine fairly often. I put on a lot of track miles! Getting it tested isn't a bad idea but I like to learn things so it would be cool to me to know.
Safety Car
Joined: Sep 2010
Posts: 3,752
Likes: 190
From: Indiana PA
Nathan, you could not have said it better. I find the C4 section to be the most informative of the entire Forum and it's because of a bunch of guys who don't mind sharing their knowledge and expertise with guys like me that are not as skilled or knowledgeable. It's not difficult to sort out the guys who've been there, done that and have the expertise, certified or not versus the relatively smaller group that feels the need to provide an opposing opinion just because they want some air time or need to get their post count up. I'm by and large a lurker that enjoys this forum and don't usually make comment. It' because of the knowledgeable guys here that I tackle small jobs on my C4 that I otherwise would be intimidated by. To you real experts who have walked that mile and have the expertise please don't desert us.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
I learned a lot of stuff by working on my car and studying the FSM.
I also learned a lot of stuff by saying things on here that were wrong, either out of ignorance (didn't know about the vent) or because I forgot something that made a difference. I hate it when I'm wrong and put out bad information. Fortunately there are knowledgeable people on the forum to correct me...
Reminds me of something I saw years ago:
"You have the ability to learn from your mistakes. You will learn a lot today."
I also learned a lot of stuff by saying things on here that were wrong, either out of ignorance (didn't know about the vent) or because I forgot something that made a difference. I hate it when I'm wrong and put out bad information. Fortunately there are knowledgeable people on the forum to correct me...
Reminds me of something I saw years ago:
"You have the ability to learn from your mistakes. You will learn a lot today."
Instructor
Joined: Feb 2007
Posts: 132
Likes: 3
From: CRYSTAL RIVER FL.
Team Owner
Joined: Sep 2003
Posts: 25,381
Likes: 2,735
http://forums.corvetteforum.com/c4-t...questions.html
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
