Boom Racing 30/8T Reverse HD Steel Triangular Keyed Bevel Helical Cut Diff Gear w/ Spool Set for BRX70/BRX80/BRX90 PHAT™ Axle for BRX01

Type: 30/80T Standard Reverse
Sale price$32.90 USD
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  • This is a HD steel reversed-cut helical triangular keyed gear set made for the rear axle of BRX01. It has the AR44 style ring/pinion gear and locker but with a flipped diff design.

    Hardened steel 30T/8T helical bevel gear and input shaft and differential locker (spool) set.

    Suitable for counter-rotating drivetrain with opposite spinning direction center driveshafts.


    • Hardened steel gears for maximum strength and durability, increased weight in the axle
    • Keyed spool to increase structural strength and to eliminate the weakness of the three M2.5 screws
    • Tight tolerance of the diff locker and the axle shaft
    • Tight tolerance of the bevel gear and input shaft to increase efficiency in the drivetrain


    • 1x Reverse Cut Triangular Keyed HD Steel Bevel Gear 30T
    • 1x Reverse Cut HD Steel Input Shaft 8T
    • 1x Keyed HD Steel Differential Locker (Spool)
    • 3x M2.5 hardware

    Will fit:
    • Boom Racing BRX70/BRX80/BRX90 PHAT Axle (Note: must be black color Third Member which fits reverse axle gear, red color Third Member will not fit)
    • AR44 style ring/pinion gear and locker with flipped diff feature

    Will not fit
    • Stock AR44 axle housing

    Bearing Size:
    • D7x14x3.5 #BBZ687OPEN x2 (not included)

    Replacement parts:
    30T Main Gear
    8T Input Shaft
  • Package total weight: 38.00 grams (incl. packaging)
  • Factory description: Boom Racing BRX01 Heavy Duty Reversed Keyed Bevel Helical Gear 30/8T Set + Differential Locker Spool Set for BRX70 Axle
  • Manufactured by Boom Racing
  • Manufacturer number: BRLC7039


We ship to most countries of the world except Ukraine, Russia, Belarus and Czech Republic. Shipping costs will apply and will be added at checkout.

It depends on where you are. Order processing time takes 1-3 business days. 

If you are in the United States or Canada, we give priority to delivery at the local warehouse, which will take about 3-5 days. If the products are not available at local warehouse, then we will ship at the Chinese warehouse, which will take 8-15 days. 

Delivery to other countries will take 8-15 days.

At this time we only ship to the US. We recently built a warehouse in Canada, and it only takes 3-5 days for all cars and planes to be delivered to the local area. We will continue to build our own warehouses around the world, including Europe, Asia, etc., so stay tuned...

We only ship these two sizes to the US and Canada because they are too bulky to ship from our warehouse in China.

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