Yokomo B9-501GAA BD9 Aluminium Drive Cup - Race Trim  [B9-501GAA]

Yokomo B9-501GAA Aluminum drive cup for BD9 Gear diff
Price:
NZD$19.81
Brand:
Yokomo
Model:
B9-501GAA
GTIN:
0639342204656
Condition:
Brand New
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Trimmed Rotational Mass for Better Response

The Yokomo B9-501GAA aluminium drive cup is a finely finished upgrade tailored to the BD9 gear differential. Made from light aluminium with an anodised coating, it reduces rotating inertia to help the car respond quicker to throttle inputs. The profile allows for a resin protector on the universal shaft side to keep drivetrain compatibility with common components. Lower rotational mass also reduces gyroscopic effect for more precise handling.

Where It Fits and What To Expect

This component is compatible with a range of Yokomo chassis including MRTC-BD919, MRTC-BD10, and MSR-BDFWD. Swapping from steel to aluminium lowers overall drive weight and can improve drive efficiency, which is useful for track tuning and lap time optimisation.
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.

Does the aluminium cup need specific grease or oil?

Use the same diff oils you normally run; the cup material does not require unique lubricants. Ensure oils are suitable for your setup and track conditions.

Can I run this with stock universal shafts?

Yes, it is designed to work with standard universal shaft arrangements and accepts a resin protector on the shaft side for secure fitting.

How durable is the anodised finish under heavy use?

The hard anodised surface offers good abrasion resistance, but inspect the cup after extended racing to catch any wear early.

Will this affect diff tune or settings?

The part itself does not change internal diff settings, but reduced rotating mass can make tuning feel different; small adjustments to oil weight or preload may be beneficial.

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