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Red Line Heavy ShockProof Gear Oil 1QT - Universal
Red Line Heavy ShockProof Gear Oil 1QT - Universal

Red Line Heavy ShockProof Gear Oil 1QT


Read 1 Reviews | 4 Q&As
Part # 58204
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Universal part

Features & Product Details

RallySport Direct is proud to provide the automotive enthusiast with a great selection of Red Line Fluids. 

On this page, you are looking at the Red Line Heavy ShockProof Gear Oil. The ShockProof can be used by itself or as a cocktail with other Red Line transmission fluids depending on what application you choose to use it on. 



  • Features a unique lubricant containing a suspension of solid microscopic particles as an extreme pressure agent along with a unique solid dispersion that cushions gear teeth to help prevent tooth breakage which allows the use of lower viscosities
  • Many performance racing applications like Sprint, Midget, Dirt lane Model, and Quick Change Differentials, Detroit Lockers and Spools, NHRA Top Fuel and Funny Car rear ends
  • Acts like a liquid grease as the viscosity characteristics allow the lubricants to resist throw-off and provide the protection of greater film thickness with a relatively light fluid viscosity which offers the "best of both worlds" balance of low drag and superior protection
  • Works in a variety of differential and transmissions
  • Recommended for heavily-loaded racing differentials and transmissions, and Off-road racing and problem gearboxes
  • Provides a film thickness similar to a 75W250 grade while providing the same low fluid friction as an SAE 75W90 oil
  • Fully-synthetic formula created from polyol ester base stocks, offer excellent lubrication under extreme conditions 
  • Ester base stocks and friction modifiers (except NS) provide additional slipperiness to lower operating temperatures by reducing the sliding friction in hypoid gears
  • High viscosity index (VI) to provide a latively constant viscosity and film thickness with varying temperature change 
  • Superior shear stability and reduced oxidation compared to other synthetics and conventional gear oils 
  • Exceeds GL-5 specifications
  • Engineered to provide the highest degree of protection and improvement of differential efficiency for better mileage, longer drain intervals, and less wear
  • Sold individually in a 1 US-quart container


  • The Red Line Heavy ShockProof should not be used with pumps, filters, and with small lines as this fluid is designed for wet sump or splash type lubrication


    Brand: Red Line
    Class: Not supplied
    Friction Modifier: No
    Type: Synthetic
    Volume: 1 qt
    Color: Red
    Mfgr. Warranty: No Warranty
    Condition: New Product
    Return Policy:

    RallySport Guarantee - 30 Days

    Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

    RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

    The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.



    1 Reviews
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    04 Wrx 5spd 8 years ago
    5out of 5stars

    I used this in the Uncle Scotty's Cocktail V2. With the mix my trans feels 100% better in shifts. I recommend this to anyone.
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    • Q: Aftermarket Gears?  SubiWRX033 years ago

      If I do aftermarket ra gears in my 2003 wrx 5spd would this oil be good for higher horsepower applications?
    • Q: 13 WRX  happyhippy460542756 years ago

      • 0 of 0 people found the following answer helpful

        A:  This fluid can be used in a WRX transmission, however we recommend mixing it with 75W90 gear oil because this fluid is very thick.

        Zach G. @ RallySport Direct 6 years ago  
        Was this answer helpful?
    • Q: which is better for a daily driver and track use?  Manuel2011STI7 years ago

      lightweight gear oil or heavy gear oil??
      • 0 of 0 people found the following answer helpful

        A:  Here is a link to the gear oil by Redline that we would recommend for daily driving and a little bit of track use:

        guest57853c642a8d25b5018c44a7 @
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    • Q: Long Term Usage?  garcia.bryan827 years ago

      Is this recommended to be used for 30-50K miles in the rear differential, just like OEM or equivalent fluid?
      • 0 of 0 people found the following answer helpful

        A:  Yes, this fluid can be used for OEM intervals.

        guest56ad69792a8d256e198b66b5 @
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    This Part Fits

    Universal Product
    This item is non application specific.
    Please verify compatibility before purchase. May require some modification for proper installation.