Pro or Street Gears?

by Brittany Foster

Are you looking to upgrade your stock ring and pinion gear to a high performance aftermarket gear? If so, you may be wondering whether you should use a Street Gear or a Competition Gear (also known as a Pro Gear). So what’s the difference between each gear type and which is best for your vehicle?

Here’s a quick rule of thumb – if you plan on driving your car on the road as a daily driver, you’ll want to go with a Street Gear. Street gears are manufactured using a harder material, 8620 grade steel (and sometimes 4320 grade steel depending on the gear type). There is a lower level of nickel content that is meant for vehicles operating at less than 1,000 horsepower. If you are looking to be faster out on the road, street gears are the perfect replacement for stock OEM gears and can be used on the road whenever and wherever. Depending on the weight and power of your vehicle, street gears may also be used out on the drag strip for some weekend fun on the race track. Although, to prevent gear failures, we recommend using a competition gear for anything with serious horsepower being used on the drag strip/race track.

Pro vs street gears infographic

If your vehicle is used aggressively on the drag strip, for professional racing, or you just enjoy over 1,000 horsepower of awesome performance, you’ll want to consider a Competition Gear. Competition gears are made from 9310 grade steel, which have a higher nickel content, and a softer alloy that is made to flex and absorb the shock-load of high-torque, high-impact racing applications. Competition gears are typically not meant for daily drivers because constant speeds and traveling long distances on the road will result in severe wear and premature gear failure.

Competition/ Pro gears require a completely different heat process due to the higher nickel content in the steel. Pro gears are heat treated in a batch furnace to be carburized, followed by re-heating in a reheat furnace where it can be press quenched to produce surfaces that are more resistant to wear. Street gears are heat treated to provide a longer gear life in a pusher furnace, and then followed by the press quench process. At US Gear, we not only do our own heat treating in-house at our plant in Chicago, IL, but we also do our own gear cutting and gear analysis right on site. For added performance and durability, our entire product offering for Street and Pro ring and pinion gears are available in our Lightning® Series, which undergo an Isotropic Superfinishing (ISF®) treatment that eliminates the need for break-in and reduces friction and wear.

Our Street gear sets are available for the following gear types:

Chrysler 8.7” IRS- Getrag H226 for 2010-2014 SRT8 Challenger/ Charger/ Magnum, Chrysler 8.75” (489), Dana 36 for 1984-1996 Corvette, Dana 44 for 1980-1982 Corvette, Dana 60 , Ford 8”, Ford 8.8” Ford Super 8.8” IRS Ford 9” GM 8.4” for 1963-1979 Corvette GM 8.6” for Gen 5 Camaro SS (V8 engine only) GM 10 Bolt and GM 12 Bolt Car 8.875”

Our Competition/Pro gear sets are available for the following gear types:

Dana 60 Pro, Ford 9” Pro (large and small pinion), Ford 9.5” Pro, Ford 10” Pro, and GM 12 Bolt Car Pro 8.875”

To find a distributor near you, please click here, or if you have any questions, please contact us at sales@usgear.com.

Download our 2019 US Gear catalog here.

COMMENTS:

  • Dean Hargesheimer:

    May 24 2019

    Great clarification of the differences and uses of your gears

  • Aug 05 2019

    Great difference between these two gears. How about the pricing difference?

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