does this have the friction modifier already in it for limited slip rears?

No, if your differential calls for the additive, you have to add some anyways. This is the case with dodge differentials 8.25" and 9.25" in the rears with limited slip. The OEM manual should say to add it if its limited slip or has trak-lok. Excerpt from manual "Trac-lok™ equipped axles require a friction modifier be added to the lubricant."

I have a G80 locker differential in my 99 silverado and not limited slip. Is this the correct stuff?

yes, for use with or without limited slip

I have a 1980 350 chevy dump truck.. can I use this fro gear oil??

Yes you can, it is a synthetic gear oil and also designed for limited slip gearing.

what is best gear oil for1983 300d 123 mercedes . n.russell

Not knowing the specifications for gear oil *rear end oil" for Mercedes, which I expect will be the same as most every automobile since about 1990 or thereabouts, This Lucas oil is the best there is. Most auto manufactures spec oils and greases with "proprietary" numbers, but the product on the inside of the can has the same specifications pretty much.

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⚙️ Gear up with Lucas Oil – where precision meets performance!

ADVANCED SYNTHETIC FORMULA - Delivers enhanced thermal stability and wear resistance for longer transmission life
OEM REPLACEMENT CONFIDENCE - Directly replaces Lucas Oil 10047, guaranteeing perfect compatibility and performance
COMPACT CONVENIENT PACKAGING - 1 quart size fits perfectly in your toolkit for quick, on-the-go maintenance
PRECISION ENGINEERED VISCOSITY - SAE 75W-90 ensures smooth shifting and maximum gear protection under all conditions
LIMITED SLIP DIFFERENTIAL READY - Optimized for limited-slip differentials to reduce chatter and improve traction

Lucas Oil 10047 SAE 75W-90 Synthetic Gear Oil is a premium, vehicle-specific transmission and differential lubricant designed to replace OEM part 10047. Its fully synthetic formula offers superior thermal stability and wear protection, making it ideal for limited-slip differentials and ensuring smooth, reliable gear operation in all driving conditions.

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Manufacturer	Lucas Oil
Brand	Lucas Oil
Model	051-507
Product Dimensions	8.26 x 8.26 x 8.26 cm; 920.79 g
Item model number	051-507
Manufacturer Part Number	051-507
OEM Part Number	10047
Item Weight	921 g
Viscosity	SAE 75W-90

Lucas Oil10047 SAE 75W-90 Synthetic Gear Oil/Transmission and Differential Lube - 1 Quart

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