Upgrade for D-MAX: Yokomo SD-302DU Upper Center Transmission Case  [SD-302DU]

Yokomo SD-302DU Upper Center Transmission Case
Price:
AUD$3.23
Brand:
Yokomo
Model:
SD-302DU
GTIN:
3888
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Or you may find similar product under the
Spares / Hop-ups - Yokomo - YD-2 category
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Product summary: SD-302DU upper case

The SD-302DU upper center transmission case from Yokomo is a machined aluminium replacement designed to pair with D-MAX standard parts. It secures the upper half of the centre gearbox, preserves gear mesh under load, and provides a firm mounting surface for bearings and shafts.

Installation is simple: remove the original upper case, transfer bearings and internal gears, fit the SD-302DU and re-torque fasteners while checking mesh and shaft alignment. Keep the same bearing sizes and fastener routes to prevent changes to drivetrain geometry.

As a tuning piece, the aluminium upper case increases rigidity and improves access for setup changes. That reduced flex helps keep gear engagement consistent and makes repeatable adjustments easier during practice and race-day tuning.
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 tuning gains are realistic with this upper case?

Expect improved stability in gear mesh under heavy load, which can translate to more consistent throttle response and reduced slop in the drivetrain when the SD-302DU is fitted and aligned correctly.

Could this affect differential or gear backlash settings?

A stiffer upper case can slightly alter perceived backlash under load; verify and fine-tune gear mesh and diff settings after installation to account for reduced flex compared with the original housing.

Any tips for quick trackside adjustments?

Check shaft alignment and gear mesh immediately after refitting, use small incremental fastener adjustments, and keep a reference torque for repeatable results when swapping or servicing the SD-302DU.

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