B-Max4 Diff Ring Gear Replacement, 2 pcs - Yokomo BM-503  [BM-503]

Yokomo BM-503 Diff. Ring Gear for B-Max4
Price:
CAD$4.70
Brand:
Yokomo
Model:
BM-503
GTIN:
3888
Please kindly input your name and email address, we will inform you once we have the restocking.
Or you may find similar product under the
category
Write a review

Replacement Ring Gear for B-Max4 Differentials

The Yokomo BM-503 is a direct replacement diff ring gear intended for use in B-MAX4 RC differential assemblies. This item is supplied as two ring gears and is designed for scale model differential rebuilds and routine maintenance rather than any real vehicle application.

When servicing a B-MAX4 differential, matching the ring gear tooth count and flange fit is essential to maintain correct mesh and predictable drivetrain behavior. The BM-503 set is suited for replacing worn stock gears or preparing a unit for setup changes.

Installation notes: make sure the ring gear sits flush against the differential case, set pinion-to-ring gear mesh using an appropriate shim technique for your spur and pinion, and verify smooth rotation before final assembly. Use the specified bearings and fasteners for B-MAX4 parts to prevent fitment problems.

Packing includes

  • Diff Ring Gear x 2 pcs
Remark :
Due to limited stock availability, please notice that some Yokomo items may have to order from the factory and the ready time is around 4-6 weeks. Customer purchases the item is assumed to accept the waiting time which allows us to order directly from the manufacturer if the item is out of our warehouse.

What steps should I follow when fitting the BM-503 ring gear?

Clean mating surfaces, press or carefully tap the ring gear onto the diff case until it is fully seated, then check gear mesh with shims and rotate the assembly by hand to confirm there is no binding.

Will these gears fit if my B-MAX4 has aftermarket internals?

They are made to the standard B-MAX4 flange and tooth profile; confirm the aftermarket internals do not change the mounting flange or tooth count before installation.

Any tips for ensuring long life after installation?

Use proper bearing preload, maintain correct mesh, apply suitable lubricants, and inspect periodically for wear to extend service life.

Copyright © 2008-2026 rcjaz.ca All rights reserved