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
907 g
Liquid Volume
1 quarts
Material
Blend
Package Information
Bottle

🔥High-temp stability

⚙️75W-90 synthetic viscosity

🛡️Extreme pressure gear protection

€ 54.37

Duties & taxes included

In stock

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Description

⚙️ Gear up with the lube that never quits – because your ride deserves the best!

LIMITED SLIP READY - Perfectly formulated for limited-slip differentials, enhancing traction and control.
OEM REPLACEMENT CONFIDENCE - Directly replaces Lucas Oil 10047, guaranteeing compatibility and reliability.
HEAVY DUTY PRESSURE DEFENSE - Special additive package cushions gears and resists squeeze-out under intense loads.
UNMATCHED THERMAL RESILIENCE - Stays slick and effective even at extreme temperatures, preventing breakdown.
PRECISION ENGINEERED VISCOSITY - 75W-90 synthetic formula ensures optimal gear performance under all conditions.

Lucas Oil 75W-90 Synthetic Gear Oil is a premium, non-foaming lubricant designed for heavy-duty and high-performance vehicles. It features a specialized additive package that protects gears under extreme pressure and high temperatures, making it ideal for limited-slip differentials and OEM replacement. Trusted by professionals and ranked top in heavy-duty vehicle oils, this 32 oz synthetic blend ensures long-lasting, reliable gear protection.

Specifications

ASIN	B000BCIHH0
Best Sellers Rank	#6,751 in Automotive ( See Top 100 in Automotive ) #2 in Heavy Duty Vehicle Oils #109 in Motor Oils
Brand Name	Lucas Oil
Container Type	Bottle
Customer Reviews	4.8 4.8 out of 5 stars (1,776)
Global Trade Identification Number	00049807100476, 10049807100473
Included Components	automotive,gear,oils
Item Form	Oil
Item Highlight	OEM replacement, replaces Lucas Oil 10047, for outdoor power equipment, 32 Oz. Size, Synthetic, 051-507
Item Type Name	Gear Oil
Item Weight	907 g
Liquid Volume	1 quarts
Manufacturer	LUCAS OIL
Material	Blend
Model Number	051-507
Number of Items	1
Number of Packs	1
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 Fluid Ounces
Upper Temperature Rating	1 Kelvin
Viscosity	75W-90
Warranty Description	Manufacturer Warranty

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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