Yukon Gear & Axle 3 Qt 80W-90 GL-5 Gear Oil Kit with 4 oz Positraction Additive — Conventional, Limited-Slip Ready

Yukon Gear & Axle 3 Quart 80W-90 conventional gear oil kit supplies three quarts of GL-5-rated oil plus a 4 oz bottle of Yukon Positraction additive to help condition limited-slip differentials and protect hypoid gears under load.

This kit bundles straightforward, conventional 80W-90 gear oil with a concentrated friction modifier so you get the base lubricant and the small dosing bottle needed for many posi-style differentials. It’s designed for DIY mechanics and professional techs who want a reliable, GL-5-quality oil for manual transmissions and differentials that require a friction-modified formula. The combination makes it easy to add the correct amount of additive without buying a separate full-size bottle.

Which vehicles and service points is this kit suited for?

This 3-quart pack works well for many passenger cars, light trucks, Jeeps, and older 4x4s that take conventional 80W-90 gear oil and require or accept a friction modifier for limited-slip or posi differentials. Always cross-check your vehicle’s owner manual or service data for recommended viscosity and additive requirements.

• Typical applications: rear differentials, front axles, manual transmissions where 80W-90 GL-5 is specified
• Useful for limited-slip differentials when a friction modifier is called for
• Convenient quantities for single-axle service or topping off

How do I apply the Positraction additive with the 80W-90 oil?

Follow the vehicle manufacturer’s prescribed dosage for friction modifiers; the included 4 oz Yukon Positraction bottle is sized for common ratios of oil to additive, but some differentials require only a small dose. Pour the additive into the differential housing after draining the old fluid and before refilling with the 80W-90 oil, then reinstall the fill plug and run the vehicle briefly to distribute the product.

• Drain old gear oil fully before adding the additive
• Add the specified amount from the 4 oz bottle to the empty housing
• Refill with three quarts of 80W-90; verify final level at the fill plug

What protective properties does 80W-90 GL-5 oil provide?

Conventional 80W-90 GL-5 is formulated to protect hypoid and spiral-bevel gear sets operating under heavy loads and sliding contact. It offers film strength and extreme-pressure additives to reduce wear and scoring while maintaining proper viscosity across typical operating temperatures for many vehicles.

• Extreme-pressure additives to guard against scuffing in hypoid gears
• Stable viscosity for consistent lubrication under load
• Compatibility with metal surfaces commonly used in gearboxes and axles

Can I mix this conventional oil with synthetic gear oils or other brands?

Mixing conventional 80W-90 with a synthetic gear oil is generally possible but may alter performance characteristics; consult your vehicle specs and the oil manufacturers’ recommendations before mixing. If your differential specifically requires a full-synthetic product or a particular additive chemistry, choose the appropriate oil instead of blending.

• Mix only if both products list compatible specifications (viscosity and GL rating)
• When in doubt, replace with a single-product fill to ensure predictable performance
• Do not over-dose friction modifier; follow recommended levels

Who this is for: This Yukon Gear & Axle 3 qt 80W-90 kit is intended for vehicle owners, mechanics, and off-road enthusiasts who service differentials and transmissions that call for conventional GL-5 80W-90 oil and sometimes require a friction modifier for limited-slip operation. It’s a practical, workshop-friendly option for single-service jobs, fluid top-ups, or when you want a paired additive bottle sized for common posi installations. Always verify compatibility with your vehicle’s service manual before use.