Do i need to add limited slip additive to this oil for my 2015 gmc positrac rear end?

Look in your Owner's manual and it should give you a part number. If it's the same part number you don't need to add anything. If you need that then you would buy the oil with it already added to it

Is this full synthetic?

Says on the back it’s synthetic.

How much fluid is needed?

3 qts for 12 bolt rear differential

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Genuine GM 19300457 SAE 75W-85 Rear Axle Fluid - 1 Quart

Product ID: 406651270

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Details

Brand
General Motors
Package information
Bottle
Liquid volume
32 Fluid
Recommended uses for product
Vehicle
Viscosity
75W-85

⏳Superior oxidation resistance extends fluid life

🔧Vehicle-specific fit for 2014 Silverado & Sierra

🛢️SAE 75W-85 viscosity for optimal performance

Description

🛠️ Keep your Silverado & Sierra running smoother, longer — don’t let your axle fluid be an afterthought!

TRUSTED OEM QUALITY - Genuine GM fluid guarantees factory-level performance and peace of mind
COMPACT READY TO USE - 1 quart size designed for easy handling and precise fluid top-ups
TAILORED FOR YOUR RIDE - Specifically formulated for 2014 Silverado and Sierra rear axles for perfect compatibility
EXTENDED SEAL LONGEVITY - Advanced oxidation resistance protects seals, reducing maintenance frequency
PRECISION ENGINEERED VISCOSITY - SAE 75W-85 ensures smooth, reliable rear axle operation under all conditions

Genuine GM 19300457 SAE 75W-85 Rear Axle Fluid is a 1-quart, vehicle-specific lubricant designed for 2014 Silverado and Sierra models. It features superior oxidation resistance to extend seal life and maintain optimal rear axle performance, ensuring OEM-level reliability and protection.

Specifications

Manufacturer	GM
Brand	General Motors
Model	19300457
Product Dimensions	23.62 x 6.86 x 7.62 cm; 907 g
Item model number	19300457
Exterior	Painted
Manufacturer Part Number	19300457
OEM Part Number	19300457
Item Weight	907 g
Viscosity	75W-85

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