|
Re: 8 3/4 gear oil, whats the best?
[Re: killercoronet]
#748885
07/15/10 01:55 PM
07/15/10 01:55 PM
|
Joined: Jan 2003
Posts: 21,071
Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
|
oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,071
Niles , Ohio
|
Ive used regular old gear oil for 45 years.Just add the SG additive.Rocky
Chrysler Firepower
|
|
|
Re: 8 3/4 gear oil, whats the best?
[Re: killercoronet]
#748886
07/15/10 02:09 PM
07/15/10 02:09 PM
|
Joined: Apr 2007
Posts: 2,826
NY usa
540challenger
master
|
master
Joined: Apr 2007
Posts: 2,826
NY usa
|
Quote:
Whats the best oil to run in my Coronet rearend? Its an 8 3/4 with 3:55 suregrip, street car. I was thinking about trying the royal purple. Suggestions?
I run royal purple 75w-140 in my 8 3/4 3.55 tru-trac No addtive as my diff. doesn't require it.
|
|
|
Re: 8 3/4 gear oil, whats the best?
[Re: PJ68RT]
#748889
07/15/10 03:10 PM
07/15/10 03:10 PM
|
Joined: Apr 2007
Posts: 2,826
NY usa
540challenger
master
|
master
Joined: Apr 2007
Posts: 2,826
NY usa
|
Quote:
Where can you buy the SG additive?
Any autopart store will have it "limited slip additive" A lot of guys including myself like the GM version you can get through the dealer. If you say sure grip additive unless they are a mopar guy expect to see this on the face 
|
|
|
Re: 8 3/4 gear oil, whats the best?
[Re: killercoronet]
#748890
07/15/10 05:45 PM
07/15/10 05:45 PM
|
Joined: Jan 2003
Posts: 5,894
Florida
Locomotion
master
|
master
Joined: Jan 2003
Posts: 5,894
Florida
|
I use Amsoil Severe Gear 75w-90 synthetic in my race car, tow truck and everyday truck. They also have 75w-110 and 75w-140. The lighter viscosity will free up a bit more power and mpg if you don't need the higher viscosity versions.It all has a limited slip additive but on rare occasions, you may have to buy some seperately. Amsoil Severe Gear 75w-90 Good stuff which my differential guy like also.
|
|
|
Re: 8 3/4 gear oil, whats the best?
[Re: therocks]
#748892
07/15/10 11:07 PM
07/15/10 11:07 PM
|
Joined: Feb 2005
Posts: 4,884
Michigan
MNobody
master
|
master
Joined: Feb 2005
Posts: 4,884
Michigan
|
Quote:
Ive used regular old gear oil for 45 years.Just add the SG additive.Rocky
Same here, 80-90w with friction modifier.
|
|
|
Re: 8 3/4 gear oil, whats the best?
[Re: DoctorDiff]
#748897
07/16/10 03:29 PM
07/16/10 03:29 PM
|
Joined: Apr 2008
Posts: 1,285
Pacific NW USA
CompSyn
pro stock
|
pro stock
Joined: Apr 2008
Posts: 1,285
Pacific NW USA
|
Quote:
The chart does not list the GL rating of each oil. Isn't that a very important factor when comparing shear stabilty?
The gear lubes tested in the chart are American Petroleum Institute (API) GL-5, SAE 75W-90 synthetic gear lubes. Samples of API GL-5, SAE 80W-90 petroleum gear lubes were also included for comparative purposes.
The chart is one of many taken from: A Study of Automotive Gear Lubes - pdf. link
|
|
|
Re: 8 3/4 gear oil, whats the best?
[Re: MoparforLife]
#748899
07/16/10 04:51 PM
07/16/10 04:51 PM
|
Joined: May 2005
Posts: 4,723
Florida
BDW
master
|
master
Joined: May 2005
Posts: 4,723
Florida
|
Quote:
Any rear end lube that is on sale at your Wallymart or any other store. 
 Works for me, used the GM additive suggested by Dr Diff.
|
|
|
Re: 8 3/4 gear oil, whats the best?
[Re: CompSyn]
#748902
07/16/10 10:55 PM
07/16/10 10:55 PM
|
Joined: Jan 2006
Posts: 704
USA
rftroy
super stock
|
super stock
Joined: Jan 2006
Posts: 704
USA
|
The chart is one of many taken from: A Study of Automotive Gear Lubes - pdf. link
This study is published by Amsoil Inc., and, surprise, Amsoil Severe gear 75W-90 comes out on top.
I'll take this one with a large grain of salt, thank you.
Bob
AAR 4-speed 3.91, Tor-Red;
70 440 6 pack Roadrunner 4-speed 3.54, Plum Crazy;
68 Formula S conv 383 4-speed 3.23, Electric Blue;
69 Barracuda conv Slant 6 OD4 2.94, 71 B5 Blue;
78 Lil' Red Truck, Red;
70 Challenger S/E. 505 6 pack, Passon 5-speed, 3.55, B7 Blue
|
|
|
|
|
I dont think a street car is going to generate enough heat to warrant the expense of synthetics in this app
