Gear Oils

Whether you're servicing a differential, manual transmission, or transfer case, the right gear oil is critical for long-term durability and quiet operation. Our collection includes a full spectrum of gear lubricants from trusted manufacturers, covering common viscosities, GL ratings, and both conventional and synthetic formulations.

Key considerations when selecting gear oil:

  • API GL Rating: GL-4 for moderate hypoid gears (many transaxles), GL-5 for high-pressure hypoid differentials. Some applications demand a specific rating—check your service manual.
  • Viscosity: Single-grade (SAE 80, 90, 140) and multi-grade (75W-90, 80W-90) options suit different temperature ranges and gear loads.
  • Base Oil: Conventional mineral-based oils are cost-effective for standard duty; synthetic fluids offer better thermal stability, reduced friction, and longer change intervals—especially in towing or performance applications.
  • Limited-Slip Friction Modifiers: Many differentials require a dedicated additive or a gear oil already formulated for clutch-type limited-slip units.

Browse by viscosity, brand, or vehicle application to find the correct fill for your project. Always consult your owner’s manual or a trusted reference for the exact specification before ordering.

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$356.88 $396.52
-10%
In stock
Cusco 75W-85 Mission Oil for FF/MR/4WD Front - 1L Mineral Non-Synthetic
$31.50 $35.00
-10%
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Cusco AP1 80W-140 GL-5 Rear Differential LSD Oil (RWD/4WD) - 1L Partial Synthetic
$53.10 $59.00
-10%
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Cusco LSD Oil NEO 80W-90 API GL-5 1L Mineral Gear Oil for RWD & 4WD Rear Differentials
$35.10 $39.00
-10%
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Yukon Gear 80W90 Conventional Gear Oil (3 Quarts) with Positraction Additive for Select 1980-2018 AMC/GM

$49.89

In stock
Three one-quart bottles of Yukon Gear Penzoil 80W90 conventional gear oil for differential service.

$39.89

In stock
Yukon Gear Redline Synthetic Shock Proof Oil & Positraction Additive (3 Quarts) - Select AMC & GM 1980-2018

$112.89

Low in stock
One quart bottle of Royal Purple Synchromax synthetic manual transmission fluid with purple label and gold cap.
$113.94 $143.94
-21%
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One quart bottle of Royal Purple Max ATF full synthetic high performance automatic transmission fluid
$101.94 $125.94
-19%
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One quart bottle of Royal Purple Max Gear 75W140 high performance synthetic gear oil
$131.94 $161.94
-19%
Low in stock
One quart bottle of Royal Purple Max Gear 75W90 synthetic automotive gear oil.
$119.94 $143.94
-17%
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5 gallon pail of Royal Purple Max Gear 75W90 high performance synthetic automotive gear oil
$351.99 $439.99
-20%
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Red Line CV-2 high-performance synthetic grease 14oz tube with molybdenum

$177.90

In stock
14oz jar of Red Line CV-2 high-performance synthetic grease with organic moly

$71.56

In stock
One gallon bottle of Red Line Synthetic 80W250 GL-5 Gear Oil

$413.16

Low in stock
One quart bottle of Red Line SuperLight ShockProof synthetic gear oil for racing transaxles.

$311.88

In stock
One gallon container of Red Line LightWeight ShockProof synthetic gear oil

$399.16

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One quart bottle of Red Line LightWeight ShockProof Gear Oil with blue label and distinctive red logo.

$311.88

In stock
One gallon jug of Red Line 75W90NS synthetic GL-5 gear oil for manual transmissions and transaxles.

$405.96

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One quart bottle of Red Line 75W90NS High-Performance Synthetic Gear Oil with red cap and label

$305.88

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One gallon jug of Red Line Heavy ShockProof Gear Oil for racing differentials and high-load gearboxes.

$399.96

In stock
One quart bottle of Red Line Heavy ShockProof Gear Oil

$311.88

In stock
One quart bottle of Red Line 80W140 synthetic GL-5 gear oil with friction modifiers.

$311.88

In stock
One quart bottle of Red Line 75W140 Synthetic Gear Oil with a red label and white screw cap

$321.48

In stock
5 gallon pail of Red Line 75W90 GL-5 full synthetic gear oil

$479.19

In stock
One gallon bottle of Red Line 75W90 GL-5 full synthetic gear oil

$391.56

In stock
One quart bottle of Red Line 75W90 High Performance Synthetic Gear Oil with red and blue label

$311.88

In stock
One quart bottle of Red Line 75W110 Synthetic GL-5 Gear Oil

$310.68

In stock
One quart bottle of Red Line 75W140NS GL-5 gear oil for limited-slip differentials and vintage transmissions.

$305.88

In stock
One quart bottle of Red Line MTLV 70W/75W GL-4 high-performance synthetic manual transmission lubricant.

$305.88

In stock

Can’t Find the Part You Need?

Our catalog represents only a portion of the automotive products available through our supplier network. If you cannot find a specific part, brand, or application on our website, submit a request below, and our team will help source it for you.

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