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This product currently has 6 reviews
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Customer Performance Survey:
Customers surveying this product said...
100%"Improves performance"
Currently all feedbacks are left by AsiaTees customers.
- Introducing the strongest AR44/AR45 axle gears to date: Keyed Underdrive 33/8T HD Helical Bevel Gears + Differential Locker Set for AR44/AR45 housings #BR955042.
The SCX10 II stock axle gears are known to be a weak point in the housing. After releasing the popular Keyed 27/8T Overdrive Hardened Steel Gears, requests were sent in for underdrive gears. So YOU asked, and we listened!
Here is the new heavy-duty underdrive 33/8T helical bevel gear & diff locker set.
Designed for the AR44/AR45/Capra Currie F9 Axle Housing, Boom Racing AR44 PHAT Axle Housing or the BRX70/BRX80/BRX90 PHAT Axles.Use this gear to improve the performance of your crawler. Run them in the rear axle for a slower wheel speed in the rear tires. Underdrive gears help to steer in sharp turns like how a dig does and slower wheel speed in the back with higher torque output.
Features:
Underdrive gears create slower wheel speed for rear wheels to help steering with higher torque output
Hardened steel gears for maximum strength and durability
Keyed spool to increase structural strength and to eliminate the weakness of the M2 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 drivetrainFits:
Boom Racing BRX70 PHAT Axle
Boom Racing BRX80 PHAT Axle
Boom Racing BRX90 PHAT Axle
Boom Racing PHAT AR44 Axle (BR955015)
Axial AR44 Axle
Axial AR45 Axle
Axial Currie F9 Portal Axle
Includes:
1x Keyed Heavy Duty Bevel Gear 33T
1x Heavy Duty Input Shaft 8T
1x Keyed Differential Locker (Spool)
3x M2 hardware
4x 1mm washer
Bearing Size:
D7x14x3.5 #BBZ687OPEN x2 (not included)
This product will only fit one axle housing.
Replacements are available:
Diff Lock Spool - Package total weight: 36.00 grams (incl. packaging)
- Factory description: Boom Racing Heavy Duty Keyed Bevel Helical Underdrive Gear 33/8T + Differential Locker Set for BRX70/BRX90/AR44 Axles
- Manufactured by Boom Racing
- Manufacturer number: BR955042
- This item is eligible for in-store promotions
- Nobody beats our price! See our Best Price Guarantee, or your money back!
- Questions about this product? Ask Our Technical Support
- You may Request Additional Product Information for this product.
- Looking for screws / bolts to assemble this product? Email Us
Find something wrong in this description?
Help us fix it! Report An Error
Heavy Duty Keyed Bevel Helical Underdrive Gear 33/8T + Differential Locker Set for BRX70/BRX80/BRX90 PHAT™ & AR44/45/Capra Axles by Boom Racing
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- Introducing the strongest AR44/AR45 axle gears to date: Keyed Underdrive 33/8T HD Helical Bevel Gears + Differential Locker Set for AR44/AR45 housings #BR955042.
The SCX10 II stock axle gears are known to be a weak point in the housing. After releasing the popular Keyed 27/8T Overdrive Hardened Steel Gears, requests were sent in for underdrive gears. So YOU asked, and we listened!
Here is the new heavy-duty underdrive 33/8T helical bevel gear & diff locker set.
Designed for the AR44/AR45/Capra Currie F9 Axle Housing, Boom Racing AR44 PHAT Axle Housing or the BRX70/BRX80/BRX90 PHAT Axles.Use this gear to improve the performance of your crawler. Run them in the rear axle for a slower wheel speed in the rear tires. Underdrive gears help to steer in sharp turns like how a dig does and slower wheel speed in the back with higher torque output.
Features:
Underdrive gears create slower wheel speed for rear wheels to help steering with higher torque output
Hardened steel gears for maximum strength and durability
Keyed spool to increase structural strength and to eliminate the weakness of the M2 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 drivetrainFits:
Boom Racing BRX70 PHAT Axle
Boom Racing BRX80 PHAT Axle
Boom Racing BRX90 PHAT Axle
Boom Racing PHAT AR44 Axle (BR955015)
Axial AR44 Axle
Axial AR45 Axle
Axial Currie F9 Portal Axle
Includes:
1x Keyed Heavy Duty Bevel Gear 33T
1x Heavy Duty Input Shaft 8T
1x Keyed Differential Locker (Spool)
3x M2 hardware
4x 1mm washer
Bearing Size:
D7x14x3.5 #BBZ687OPEN x2 (not included)
This product will only fit one axle housing.
Replacements are available:
Diff Lock Spool - Product weight: 36.00 grams
- Factory description: Boom Racing Heavy Duty Keyed Bevel Helical Underdrive Gear 33/8T + Differential Locker Set for BRX70/BRX90/AR44 Axles
- Manufactured by Boom Racing
- Manufacturer number: BR955042
- This item is eligible for in-store promotions
- Nobody beats our price! See our Best Price Guarantee, or your money back!
- Questions about this product? Ask Our Technical Support
- You may Request Additional Product Information for this product.
- Looking for screws / bolts to assemble this product? Email Us
Find something wrong in this description?
Help us fix it! Report An Error
| Quantity Discount | |||
|---|---|---|---|
| Units at this Price | ATees' Low Price (Per Unit) |
You Save | Click To Order |
This product currently has 6 reviews
Overall Rating:
|
![]() |
Customer Performance Survey:
Customers surveying this product said...
100%"Improves performance"
Currently all feedbacks are left by AsiaTees customers.
The Heavy Duty Keyed Bevel Helical Underdrive Gear 33/8T + Differential Locker Set for BRX70/BRX80/BRX90 PHAT™ & AR44/45/Capra Axles has an average rating of
stars based on 6 customer reviews.
Boom Racing is a premium RC brand dedicated to scale realism, innovative engineering, and trail-proven performance. Known for the BRX chassis platform and product lines including PHAT™ Axles, ProBuild™ Wheels, KUDU™ Suspension Systems, and officially licensed scale vehicles, Boom Racing develops products that combine authentic scale detail with real-world capability.
Every product is designed with a focus on quality, durability, compatibility, and performance, allowing enthusiasts to build vehicles that look authentic and perform confidently on challenging terrain. From complete vehicle platforms to precision-engineered upgrades and accessories, Boom Racing offers a comprehensive ecosystem for scale RC builders and drivers.
Designed by enthusiasts for enthusiasts, Boom Racing products are trusted by hobbyists around the world who appreciate attention to detail, innovative features, and a commitment to advancing the scale RC experience.
Recent Customer Reviews - 6 Reviews Total 
The Heavy Duty Keyed Bevel Helical Underdrive Gear 33/8T + Differential Locker Set for BRX70/BRX80/BRX90 PHAT™ & AR44/45/Capra Axles has an average rating of
stars based on 6 customer reviews.
-
405 people found this review helpful November 12, 2022overall
FIT & FINISH
DESIGN
Was this review helpful? Yes -
484 people found this review helpful November 3, 2021overall
FIT & FINISH
DESIGN
Was this review helpful? Yes -
458 people found this review helpful August 8, 2021overall
FIT & FINISH
DESIGN
Was this review helpful? Yes -
479 people found this review helpful June 23, 2021overall
FIT & FINISH
DESIGN
Was this review helpful? Yes -
432 people found this review helpful April 26, 2021overall
FIT & FINISH
DESIGN
Was this review helpful? Yes
About Boom Racing
Boom Racing is a premium RC brand dedicated to scale realism, innovative engineering, and trail-proven performance. Known for the BRX chassis platform and product lines including PHAT™ Axles, ProBuild™ Wheels, KUDU™ Suspension Systems, and officially licensed scale vehicles, Boom Racing develops products that combine authentic scale detail with real-world capability.
Every product is designed with a focus on quality, durability, compatibility, and performance, allowing enthusiasts to build vehicles that look authentic and perform confidently on challenging terrain. From complete vehicle platforms to precision-engineered upgrades and accessories, Boom Racing offers a comprehensive ecosystem for scale RC builders and drivers.
Designed by enthusiasts for enthusiasts, Boom Racing products are trusted by hobbyists around the world who appreciate attention to detail, innovative features, and a commitment to advancing the scale RC experience.









