GMT-900 SUV Rear Differential Fluid

[amxguy1970]

So the last few days I have been searching forums, web pages and shopping sites and cannot be certain on this. 2012 Yukon Denali 2wd, does it have the G80 where it is a locker and that means it doesn't need a limited slip additive (ie Friction modifier) or does it have a limited slip out back and needs gear oil with the LS additive or friction modifier in it? I did my truck with a G80 so it did not need any additive, just straight synthetic gear oil, is the same stuff needed for the Yukon Denali? It is a bear finding the stuff without the additive for limited slip differentials in it. Basically it seems the trucks and suv's have the lockers and cuv's and cars have the limited slip, so that would mean the trucks and suv's (Silverado/Sierra and Yukon/Tahoe) have the same rear axles? 

 

Also, why is there no SUV GMT-900 sub forum or is it all rolled in to one?

 

Thanks for the input, everything I am seeing points to standard 75-90 gear oil without any additives or modifiers like my truck but would like to be sure before I order it. 

 

Tyler

[intheburbs]

75W-90 synthetic, no modifier needed.  The G80 doesn't utilize clutch packs the way a standard limited-slip does.  You don't have to worry about clutch chatter.

[Z45]

¨ Optional Equipment (G80 Order Code) on all GM two-wheel and four-wheel drive light trucks and sport utilities.

Benefits

¨ Improved traction differentiates the vehicle relative to other rear wheel and four-wheel drive vehicles on the market.

¨ Maintenance free; requires no lube additives.

¨ Enhanced towing and off-road performance.

¨ Patented carbon friction disc technology enhances performance and durability while reducing warranty claims.



Principles of Operation

¨ Wheel speed difference (left to right) in excess of 100 RPM will cause a flyweight mechanism to open and catch a latching bracket.

¨ The stopped flyweight will trigger a self-energizing clutch system, which results in the cam plate ramping against a side gear.

¨ Ramping increases until both axles turn at the same speed (full lock), which prevents further wheel slip.

¨ At speeds above 20MPH, the latching bracket swings away from the governor and prevents lockup from occurring.



Technical Specifications

¨ Automatic locking takes place within a fraction of a second, so smoothly that it is unnoticed by the average driver.

¨ Unlocking occurs automatically, once the need for improved traction is gone, and is unnoticeable to the average driver.

¨ Compatible with anti-lock brake systems.

[amxguy1970]

Thought so, was 95% sure they were the same. So I will be able to utilize the left over 75/90 from my truck and then and get a few more bottles and drain and fill. Thanks for the reply's fellas! 

 

Tyler