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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75/90 Trans&Diff Lube

Product ID: 4517485

Details

Brand
Lucas Oil
Item Weight
8 ounces
Liquid Volume
1 Liters
Material
Blend
Package Information
Bottle

🔥High-temp stability resists breakdown

⚙️75W-90 viscosity for optimal gear protection

🛡️Special additive package cushions gears under extreme pressure

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₨779

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Description

⚙️ Shift into the future with gear oil that never quits!

VEHICLE SPECIFIC FIT - Tailored for your ride’s exact needs, replacing OEM part 10047 seamlessly
EXTREME PRESSURE DEFENSE - Advanced additives protect your transmission and differential under the harshest conditions
HEAT RESISTANT PERFORMANCE - Maintains lubricity even at high temperatures for long-lasting durability
TRUSTED BY PROS ENTHUSIASTS - Top-rated with 4.8 stars and thousands of users who demand peak performance
PRECISION ENGINEERED VISCOSITY - 75W-90 synthetic formula ensures smooth, reliable gear shifts every time

Lucas Oil 10047 SAE 75W-90 Synthetic Gear Oil is a premium, non-foaming lubricant designed for high-performance and heavy-duty vehicles. Its advanced additive package cushions gears and resists squeeze-out under extreme pressure, while maintaining stability at high temperatures. Perfect for limited-slip differentials and transmissions, it replaces OEM part 10047 and is trusted by professionals and enthusiasts alike.

Specifications

ASIN	B000BCIHH0
Best Sellers Rank	#3,517 in Automotive ( See Top 100 in Automotive ) #2 in Heavy Duty Vehicle Oils #109 in Motor Oils
Brand	Lucas Oil
Brand Name	Lucas Oil
Container Type	Bottle
Customer Reviews	4.8 out of 5 stars 1,692 Reviews
Global Trade Identification Number	00049807100476
Included Components	automotive,gear,oils
Item Form	Oil
Item Type Name	Gear Oil
Item Weight	0.5 Pounds
Liquid Volume	1 Liters
Manufacturer	Lucas Oil
Material	Blend
Model Number	051-507
Number of Items	1
Package Information	Bottle
Part Number	051-507
Recommended Uses For Product	auto racing
SAE J300 Viscosity Grade	75W-90
Specific Uses For Product	Vehicle
UPC	049807400477 049807800475
Unit Count	32.0 Fluid Ounces
Upper Temperature Rating	1 Kelvin
Viscosity	75W-90
Warranty Description	Manufacturer Warranty

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