Crown Race Gears are REM ISF treated for maximum efficiency, allowing for harder, faster, and longer desert runs.

While desert racing vehicles may not encounter the types of shock loads found in Ultra4 racing or rock bouncing, desert runs and desert races subject ring and pinion gears to high rotational speeds for long periods of time. At race speeds, each ring gear tooth engages the pinion gear over a thousand times each minute, adding up to over a million cycles during a 20 hour race like the Baja 1000. These high speeds and extended durations create a tremendous amount of heat that robs power, burns through gear lube, and destroys axle bearings, seals, and gears.

Crown Race Gears are specifically engineered to withstand this type of abuse by starting with a steel alloy that is heat treated and then cryogenically treated to be as tough (flexible) as possible to absorb shock loads, yet have a very hard case (surface) to ensure a very long wear life and reduce friction at high speeds. This ideal gear case hardness transition is difficult to achieve, yet it is the key to making a ring and pinion set hold up to years of desert racing.

To minimize friction and reduce heat and wear, all Crown Race Gears are REM ISF finished for an aerospace grade smooth surface that, when lubricated with the correct race-weight full-synthetic gear lube, reduces power loss at the gears by almost 40%. This means that more power gets transferred through to the tires allowing for higher top speeds, faster acceleration, and significantly reduced temperatures for longer runs.

While overheating is the main cause of axle failure during a desert race, micro-fractures are the reason ring and pinion gears fail. Crown Race Gears go through two separate shot peening sessions that increase the gear density in those critical areas where testing has proven an improvement in usable life of gears by about 75%.

In addition to heat treatment, shot peening, and REM ISF finishing, Crown Race Gears are cut using 5-cut helical gear geometry that uses a sliding motion to transfer power through the gears instead of a pushing force that stays at the center of the ring gear teeth where it increases the likelihood of pitting and micro-fracturing, especially in endurance applications like desert racing.

By increasing gear toughness, creating a desirable case hardness transition, shot peening the tooth roots, and using an aerospace gear finish, Crown Race Gears are stronger, tougher, and more efficient than any other off-road racing ring and pinion gears available today, making them the top choice for any desert racer.

• REM-ISF finished for reduced friction and heat.
• Heat treated for toughness to absorb shock loads.
• Two stage shot peened for micro-fracture prevention.
• Cryogenically treated for improved toughness and durability.
• Ideal case hardness transition for maximum life.
• 5-cut gear geometry to prevent tooth pitting.
• 5-year renewable race warranty.

• Readily available for Dana 44, Dana 60, and GM 14 Bolt axles.
• Ring gear backside REM ISF finished for use with load bolts.
• Ford 8.8", 9", and 10" gears available by special order.
• Pre-treatment Magnaflux inspection available.