c5 rear diff fluid? - Tranny?
Thread Starter
Intermediate
Joined: Jul 2009
Posts: 48
Likes: 0
c5 rear diff fluid? - Tranny?
While at the autopart store, i decided to get rear end fluid (00 C5 6speed), and the guy told me it takes GL5, and i thought a synthetic would be good.
He recommended the Redline 75-90 synthetic fluid. after reading it in confusion about limited slips, i may need to add some sort of anti slip additive.
i drained it and put it in anyway, as what came out was dirty, and the new fluid resembled new/clean GL5, it was actually thicker than i thought it would be being synthetic. Anyway, it said something about rear end chatter and what not.
My question, is will this Redline be OK in there? Or has anyone used this fluid? anti slip additive?Iam assuming that it may have the potential to leak as do engines when seals are used to petroleum based oils and are then switched to synthetics.
Can i change the Tranny fluid as well? Fluid recomendations?
I dont even want to think about any fluid lasting 100,000 miles. NOT IN MY VEHICLES, thank you
Thanks guys in advance
He recommended the Redline 75-90 synthetic fluid. after reading it in confusion about limited slips, i may need to add some sort of anti slip additive.
i drained it and put it in anyway, as what came out was dirty, and the new fluid resembled new/clean GL5, it was actually thicker than i thought it would be being synthetic. Anyway, it said something about rear end chatter and what not.
My question, is will this Redline be OK in there? Or has anyone used this fluid? anti slip additive?Iam assuming that it may have the potential to leak as do engines when seals are used to petroleum based oils and are then switched to synthetics.
Can i change the Tranny fluid as well? Fluid recomendations?
I dont even want to think about any fluid lasting 100,000 miles. NOT IN MY VEHICLES, thank you
Thanks guys in advance
Safety Car
Joined: Apr 2004
Posts: 4,813
Likes: 2
From: We cant stop here... this is bat country
Trans - Amsoil ATF
http://www.amsoil.com/catalog.aspx?GroupID=208
Diff - Amsoil Severe Gear 75/90 w/ Amsoil Slip-Lock added as neccessary.
http://www.amsoil.com/catalog.aspx?GroupID=95
http://www.amsoil.com/catalog.aspx?GroupID=88
http://www.amsoil.com/catalog.aspx?GroupID=208
Diff - Amsoil Severe Gear 75/90 w/ Amsoil Slip-Lock added as neccessary.
http://www.amsoil.com/catalog.aspx?GroupID=95
http://www.amsoil.com/catalog.aspx?GroupID=88
Le Mans Master
Joined: May 2008
Posts: 5,892
Likes: 47
From: Helotes TEXAS
Trans - Amsoil ATF
http://www.amsoil.com/catalog.aspx?GroupID=208
Diff - Amsoil Severe Gear 75/90 w/ Amsoil Slip-Lock added as neccessary.
http://www.amsoil.com/catalog.aspx?GroupID=95
http://www.amsoil.com/catalog.aspx?GroupID=88
http://www.amsoil.com/catalog.aspx?GroupID=208
Diff - Amsoil Severe Gear 75/90 w/ Amsoil Slip-Lock added as neccessary.
http://www.amsoil.com/catalog.aspx?GroupID=95
http://www.amsoil.com/catalog.aspx?GroupID=88
I could not agree more !! 
That's exactly what I buy from Amsoil for my FRC.
Thread Starter
Intermediate
Joined: Jul 2009
Posts: 48
Likes: 0
OK i just called Redline, like i should of in the first place, but being at work i was just lazy.
the 75-90 GL5 will be fine and has limited slip additives
The 75-90GL5 NS however does not have additives and needs 5% limited slip additives and is not recommended in the vette unless the additive is mixed in.
Thanks for the other recommendations,
the 75-90 GL5 will be fine and has limited slip additives
The 75-90GL5 NS however does not have additives and needs 5% limited slip additives and is not recommended in the vette unless the additive is mixed in.
Thanks for the other recommendations,
Thread Starter
Intermediate
Joined: Jul 2009
Posts: 48
Likes: 0
Yeah I have used their products with motorcycles. And have had good results. They are also local for me here in the bay area (CA) never used Amsoil and I don't use the mobile one products. Any good solid name brand should be fine az long as the fluid is changed regularly.
Advanced
Joined: Jul 2008
Posts: 73
Likes: 0
From: Leesburg Florida
Trans - Amsoil ATF
http://www.amsoil.com/catalog.aspx?GroupID=208
Diff - Amsoil Severe Gear 75/90 w/ Amsoil Slip-Lock added as neccessary.
http://www.amsoil.com/catalog.aspx?GroupID=95
http://www.amsoil.com/catalog.aspx?GroupID=88
http://www.amsoil.com/catalog.aspx?GroupID=208
Diff - Amsoil Severe Gear 75/90 w/ Amsoil Slip-Lock added as neccessary.
http://www.amsoil.com/catalog.aspx?GroupID=95
http://www.amsoil.com/catalog.aspx?GroupID=88
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
2027 Corvette vs The World: Every C8 vs Its 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
Safety Car
Joined: Jul 2004
Posts: 3,904
Likes: 28
From: Vancouver Washington
OK i just called Redline, like i should of in the first place, but being at work i was just lazy.
the 75-90 GL5 will be fine and has limited slip additives
The 75-90GL5 NS however does not have additives and needs 5% limited slip additives and is not recommended in the vette unless the additive is mixed in.
Thanks for the other recommendations,
the 75-90 GL5 will be fine and has limited slip additives
The 75-90GL5 NS however does not have additives and needs 5% limited slip additives and is not recommended in the vette unless the additive is mixed in.
Thanks for the other recommendations,
I've been using Redline 75/90 in both my track car and my vert for years. It's the way to go. It's also the recommended fluid of several performance differential rebuild companies. I use Redline DT4 in my verts transmission and Redline's High Temp Auto fluid in my track car.
Pro
Joined: Nov 2009
Posts: 566
Likes: 34
From: ohio
Thread Starter
Intermediate
Joined: Jul 2009
Posts: 48
Likes: 0
noise
OK, so i drove the car around this weekend, and noticed small noises coming from the rear end when making turns with wheel locked. Minor noises but annoying. Makes me wanna flush the **** out. Of course i threw the receipt and old bottles away. Im pretty sure it was the 75-90 and not the 75-90NS, which has the limited slip additive..
Tech Contributor
Joined: Jan 2007
Posts: 19,348
Likes: 1,124
From: Dyer, IN
3rd Gear
Joined: Mar 2010
Posts: 3
Likes: 0
From: Warwick Pennsylvania
Rear Gear Oil Change Out - C6
I just got an 2006 C6 with 18,000 miles on it. Only problem I noticed with the car after I bought it was that the rear made a grinding noise, mostly when cold. I did not notice this on the test drive. I brought to chevy dealer who said right away that a service bulletin had been issued about the posi rear gear oil - the original oil allows the grinding noise and has to be replaced with a synthetic type. Unfortunately I don't know what they put in it, but it solved the problem, and I assume its a "standard GM" product. Service manager told me to go to empty parking lot and do a dozen quick figure eights to swoosh it all around. I enjoyed that almost as much as not having to face the wifey with a big repair bill.
6th Gear
Joined: May 2016
Posts: 6
Likes: 4
While at the autopart store, i decided to get rear end fluid (00 C5 6speed), and the guy told me it takes GL5, and i thought a synthetic would be good.
He recommended the Redline 75-90 synthetic fluid. after reading it in confusion about limited slips, i may need to add some sort of anti slip additive.
i drained it and put it in anyway, as what came out was dirty, and the new fluid resembled new/clean GL5, it was actually thicker than i thought it would be being synthetic. Anyway, it said something about rear end chatter and what not.
My question, is will this Redline be OK in there? Or has anyone used this fluid? anti slip additive?Iam assuming that it may have the potential to leak as do engines when seals are used to petroleum based oils and are then switched to synthetics.
Can i change the Tranny fluid as well? Fluid recomendations?
I dont even want to think about any fluid lasting 100,000 miles. NOT IN MY VEHICLES, thank you
Thanks guys in advance
He recommended the Redline 75-90 synthetic fluid. after reading it in confusion about limited slips, i may need to add some sort of anti slip additive.
i drained it and put it in anyway, as what came out was dirty, and the new fluid resembled new/clean GL5, it was actually thicker than i thought it would be being synthetic. Anyway, it said something about rear end chatter and what not.
My question, is will this Redline be OK in there? Or has anyone used this fluid? anti slip additive?Iam assuming that it may have the potential to leak as do engines when seals are used to petroleum based oils and are then switched to synthetics.
Can i change the Tranny fluid as well? Fluid recomendations?
I dont even want to think about any fluid lasting 100,000 miles. NOT IN MY VEHICLES, thank you
Thanks guys in advance
Racer
Joined: Nov 2017
Posts: 449
Likes: 158
From: Aiken, SC
The parts our cars use were being designed 25+ years ago. The notion that nothing better has come along since the last C5 rolled off the line is asinine. Not to mention factory built cars are produced with certain mileage, wear, emissions, and fuel mileage goals. There are plenty of examples where switching to thicker than factory oil may give up a few mpgs, but gain a lot of protection. With modern technology, there's no reason to assume every aspect of the car can't be improved on with negligible side effects.
Instructor
Joined: Nov 2019
Posts: 226
Likes: 21
Ignoring that this is a 9 year old thread, this is a flawed statement to make too
The parts our cars use were being designed 25+ years ago. The notion that nothing better has come along since the last C5 rolled off the line is asinine. Not to mention factory built cars are produced with certain mileage, wear, emissions, and fuel mileage goals. There are plenty of examples where switching to thicker than factory oil may give up a few mpgs, but gain a lot of protection. With modern technology, there's no reason to assume every aspect of the car can't be improved on with negligible side effects.
The parts our cars use were being designed 25+ years ago. The notion that nothing better has come along since the last C5 rolled off the line is asinine. Not to mention factory built cars are produced with certain mileage, wear, emissions, and fuel mileage goals. There are plenty of examples where switching to thicker than factory oil may give up a few mpgs, but gain a lot of protection. With modern technology, there's no reason to assume every aspect of the car can't be improved on with negligible side effects.
Last edited by Chillo32; Nov 12, 2019 at 02:52 PM.