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USD $34.90 #BR955043
  1. Drivetrain & Gears
  2. Gears
  3. Diff Gears

33T/8T Reverse HD Keyed Helical Bevel Underdrive Gear Set for AR44/AR45

Fits BRX01, BRX01 AWB, BRX02, BRX02 109, BRX02 6x6, BRX02 88, BRX02 D130

USD $34.90

Part #: BR955043


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33T/8T Reverse HD Keyed Helical Bevel Underdrive Gear Set for AR44/AR45

Fits BRX01, BRX01 AWB, BRX02, BRX02 109, BRX02 6x6, BRX02 88, BRX02 D130

USD $34.90

Part #: BR955043

33/8T Underdrive Reverse Cut 33/8T Underdrive Reverse Cut
27/8T Overdrive 27/8T Overdrive
30/8T Standard 30/8T Standard
30/8T Standard Reverse Cut 30/8T Standard Reverse Cut
24/8T Overdrive 24/8T Overdrive
33/8T Underdrive 33/8T Underdrive
33/8T Underdrive Reverse Cut 33/8T Underdrive Reverse Cut
Qty:

Warehouse Availability:

HK: In stock (ships worldwide)

US: Out of stock (ships within US and US territories only)

free shipping on non-heavy items

On US orders $120+ (including territories)

free shipping for heavy items

1 heavy item: Add $200 in non-heavy items to get free shipping.
2+ heavy items: Add $100 in non-heavy items to get free shipping.

Tagged Keywords Diff GearsBRX02 Optional PartsBRX01 Optional PartsBRX02 109 Chassis Optional PartsBRX02 88 Chassis Optional PartsBRX01 AWB Optional PartsBRX02 6x6 Optional PartsBRX02 D130 Chassis Optional Parts

PRODUCT DESCRIPTION

Upgrade your drivetrain with the Boom Racing 33T/8T Reverse HD Keyed Helical Bevel Underdrive Gear Set, engineered for strength, durability, and reliable power delivery in demanding RC crawling conditions.

Featuring a 33-tooth ring gear and 8-tooth pinion, this underdrive gear set delivers a 4.125:1 axle reduction ratio, providing approximately 9.1% slower axle rotation compared to standard 30T/8T gearing.

Unlike conventional gear sets with a circular centre interface, our triangular keyed design provides positive mechanical engagement between the ring gear and a compatible keyed differential locker. This improves torque transfer, helps distribute rotational loads, and reduces reliance on mounting screws alone to resist rotational forces.

The reverse-cut helical bevel gear design is intended for smooth gear engagement and dependable performance under load.

Features:

  • Reverse-cut 33T/8T underdrive gear configuration
  • Triangular keyed center design for improved torque transfer
  • Heavy-duty steel construction
  • Helical bevel gear design for smooth engagement
  • Designed for compatible AR44/AR45 differential gear applications
  • Ideal for underdrive setups with counter-rotating front and rear axle drivetrains

Specifications:
  • Gear Ratio: 33T/8T (4.125:1)
  • Gear Type: Reverse-cut helical bevel
  • Material: Hardened Gear Steel
  • Ring Gear Interface: Triangular keyed design
  • Gear Configuration: Underdrive
  • Differential Rotation: Reverse

Compatible:
  • Boom Racing BRX PHAT Rear Axles
  • AR44/AR45 Differential Gear-Compatible Axles (with matching keyed locker and reverse-cut configuration)

Includes:
  • Bevel and helical gear components
  • Mounting screws shown
  • Shim for adjustments

Safety Information

Not a toy. Intended for ages 14+.

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