Rear diff fluid?
Thread Starter
TECH Apprentice
Joined: Apr 2007
Posts: 369
Likes: 0
From: Clarksville
Rear diff fluid? Its that time to change the rear diff fluid again and im going with RP 75W-90 im currently using RP engine oil and I couldnt be happier with it so im gonna try their rear fluid too. Along with the RP do I need a additive and if so whats the best to use?
Joined: Nov 2001
Posts: 34,631
Likes: 2,553
From: Schiller Park, ILL Member: #317
Use a synthetic 75w90 for the diff on a '99+ car. For the '98 use a 80w90 dino oil. Those are the GM recommendations. They both call for the GM LSD additive, but from what I understand you don't *have* to have it for the '99+ rear. I still used it for mine though.
Trending Topics
seems strange that gm recomends it for a zexel that has no clutches,and zexel says you don't need it. just filled mine with mobil one. why would you need a friction modifer in a housing with nothing but gears?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Joined: Nov 2001
Posts: 34,631
Likes: 2,553
From: Schiller Park, ILL Member: #317
Originally Posted by sreve
seems strange that gm recomends it for a zexel that has no clutches,and zexel says you don't need it. just filled mine with mobil one. why would you need a friction modifer in a housing with nothing but gears?
Joined: Nov 2001
Posts: 34,631
Likes: 2,553
From: Schiller Park, ILL Member: #317
Originally Posted by Shinigami2x4
I have been meaning to ask - what is your guy's method of getting the oil back in their?
TECH Enthusiast
Joined: Jan 2006
Posts: 616
Likes: 0
From: Des Moines, IA
ah, when i did a rear change in my camaro - i was having a huge frustating time trying to get into the rear let alone the tranny - makes sense now. Thanks guys - there was a moment of stupidity..
Thread Starter
TECH Apprentice
Joined: Apr 2007
Posts: 369
Likes: 0
From: Clarksville
Yeah I wasnt sure about the additive, and when I went to pick it up from my local GM dealer he said I diddnt HAVE to have it. And ive heard "yes you need it" and "no you dont" from alot of guys. So better safe than sorry, I paid 9 bucks for it maybe a waste of money but 9 bucks is a steal for peace of mind.
Thread Starter
TECH Apprentice
Joined: Apr 2007
Posts: 369
Likes: 0
From: Clarksville
Well I changed the fluid today, now I can cross that off my list of things im never gonna do myself again! lol Going off everything was cool, fel-pro gasket and RTV went on fine even puttin the diff shield back on was easy. Filling the damn diff up with fluid SUCKED! My hand pump is a POS, RP's easy fill bottle was a joke. Got more fluid on the floor of my garage and my arms than in the damn fill hole! But after a sit down talk with a guy named Jack D and a few cigs everything worked out fine. I was havin the fill issue cause a C-clamp around my Magnaflow 3 inch pipe wasnt allowing me enough space to get that bottle in. But it worked out, gears sound good and no leaks, so all and all it was a informative experience. Thanks for the help guys. Tommarows header an ORY install day wish me luck!
