Red Line Heavy Shockproof Gear Oil - 1 Quart (58204)

Red Line Oil
Looking for the lowest price?

Give us a call to get the best prices and parts for your build. Or, just call us with a cool racing story...either way we're here.

Phone Call or Text 651-927-4510

Email -

Fits Your:
Expected Delivery by , when ordered within hrs and mins
 Need Help Getting Started?
Call Or Text Our Experts at 651-927-4510


Earn  $0.48 In MAP Rewards!

Heavy Shockproof Gear Oil by Red Line

These products contain the extreme pressure additives necessary for ultimate protection road cars and racing vehicles, as well as friction modifiers for proper limited-slip operation. It features a fully-synthetic formula created from polyol ester base stocks, offering excellent lubrication under extreme conditions. High viscosity-index (VI) provides relatively constant viscosity and film thickness with varying temperature change. Ester base stocks and friction modifiers provide additional slipperiness to lower operating temperatures by reducing the sliding friction in hypoid gears. Red Line's Heavy Shockproof Oil offers superior shear stability and reduced oxidation compared to other synthetics and conventional gear oils. It also exceeds API GL-5 specifications.

Red Line Oils are engineered to provide the highest degree of protection and improvement of differential efficiency for better mileage, longer drain intervals, and less wear.


  • Film thickness greater than an SAE 75W250, yet low fluid friction like 75W90
  • For heavily-loaded racing differentials and transmissions, problem gearboxes
  • Most popular ShockProof product, many racing and specialty applications
  • Many performance racing applications like Sprint, Midget, Dirt Late Model and Quick Change Differentials, Detroit Lockers and spools, NHRA Top Fuel and Funny Car rear ends
  • Not recommended for most synchro applications due to the product's extreme slipperiness


  • Universal

What's In The Box?

  • (1) One quart bottle


  • Manufacturer Standard Warranty


Customer Reviews

Based on 5 reviews
Great stuff

Using it in my rb25 trans and shifts smooth and is quiet

Christian Montenegro
Happy tranny!

Ive been using RedLine products for years. No matter your car brand, they work specially on hard/race conditions.

Mack Skaggs
Good lube.

Bought this fluid for my Evo 8 great performance so far.

gear oil

I use this gear oil in the tranny of my Harley. Works excellent

Joe Vernon
Smooth shifting.

Bought as part of cocktail for Subaru transmission. As part of the cocktail, it may have helped in the elimination of 3rd gear grind at high rpm. So far so good.