Yokomo B9-501GAA BD9 Aluminum Drive Cup - Lightweight Upgrade  [B9-501GAA]

Yokomo B9-501GAA Aluminum drive cup for BD9 Gear diff
Price:
CAD$15.84
Brand:
Yokomo
Model:
B9-501GAA
GTIN:
0639342204656
Condition:
Brand New
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Lightweight Aluminum Drive Cup for BD9

The Yokomo B9-501GAA aluminum drive cup is a precision machined part made for the BD9 gear differential. Machined from lightweight aluminum with a hard anodized surface, it helps reduce wear and gives a crisper throttle response. The cup is shaped to accept a resin protector on the universal shaft side, keeping compatibility with common setup choices. Cutting rotating mass lowers the gyroscopic effect and improves steering feel during rapid direction changes.

Fitment and Handling Gains

This drive cup fits multiple Yokomo chassis including MRTC-BD919, MRTC-BD10, and MSR-BDFWD. Compared with heavier steel parts, the aluminum version trims unsprung and rotating weight to enhance drive efficiency and encourage quicker corner exits, making it a practical upgrade for club racers and track day drivers.
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.

How difficult is installation of the aluminum drive cup?

Installation is straightforward for anyone familiar with BD9 gear diff service. You will need basic diff tools and a clean workspace to avoid contaminating bearings or gears.

Will this cup change maintenance intervals?

The aluminum cup does not require special maintenance, but check for wear and ensure the resin protector remains seated to prevent shaft abrasion. Regular diff checks are still recommended.

What handling differences should I expect on track?

Expect slightly faster transient responses and reduced gyroscopic resistance when rotating, which can help turn-in and mid-corner stability for high traction layouts.

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