Revolution Design B74 48P Machined Spur Gear (Center-Differential) (78T)

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Revolution Design B74 48P Machined Spur Gear (Center-Differential) (78T)
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Revolution Design B74 48P Machined Spur Gears are a direct fit option for the center differential of the Associated B74. Thanks to the high-quality material they offer greatly improved durability especially when running high-powered modified motors. The precise manufacturing also ensures the gears run very true which increases the drivetrain efficiency while keeping the noise level at a minimum. The gears are available in 72T and 78T specification for both stock and modified racing and they fit the standard Team Associated center diff cup, as well as the Revolution Design aluminium center differential case.

  • Direct fit to the B74 center differential
  • Usable with the standard composite Team Associated and Revolution Design’s aluminum center differential case
  • Available for stock and modified motor gearing
  • Machined from high-quality Delrin material
  • Precision-machined for highest possible precision
  • 72T and 78T sizes available

This product was added to our catalog on July 31, 2020

Verified Owner
Monday, Nov 28 2022 (about a year ago)
Revolution Design B74 48P Machined Spur Gear (Center-Differential) (78T)
Eh, really not that great, the main issue is the center diameter, it's too big, the original spur is much tighter so that the centering relies on the center bore and hub of the diff case, not the screws holding it. I bought 2 and both are like that.

Those spurs are maybe 0.002-0.003'' too big in the center to have a tight fit, so the centering relies mostly on the screws. Kinda like installing aftermarket wheels on a full-size car without the proper centering hub rings.

You have an obvious misalignment when you rotate the spur with the diff in the car, so the gear mesh will vary throughout the rotation.

They work, but really nothing special sadly, ''German design'' proudly displayed on the packaging, but I think they may need a GD&T class. I expected a very close to perfect true cocentric spur at that price and with that flashy packaging.