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VehiclesVanquish Products URB Jimmys 4x4 MoonbuggyUpgradesRear replacement axle and matched axle gearing

Rear replacement axle and matched axle gearing

Vanquish Products URB Jimmys 4x4 Moonbuggy · VPS09029A

The replacement rear steering axle uses 5.25:1 gearing instead of the original rear axle’s 5.78:1. With the original front axle retained, it removes the factory front-to-rear speed difference. Keep the original rear underdrive gears when repairing the axle without changing that bias.

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Parts & installation

Manufacturer documented
Vehicle
Vanquish Products URB Jimmys 4x4 MoonbuggyVPS09029A
Position
rear
Change
Replace the molded rear steering axle with VPS10568, which uses the same 5.25:1 axle gearing as the front.

Parts needed

One rear steering axle assembly; servo retained
PartQty
VPS10568F10W-P molded rear steering axle, 5.25:11

Maker-listed rear steering axle replacement. Its 5.25:1 gearing changes the original 5.775:1 rear ratio; this reference does not specify a new electronics package.

Installation notes

  • VPS10568 rear steering, VPS10567 front steering and VPS10569 non-steering rear are different products. Select the rear steering version for the existing four-wheel-steer layout.
  • The replacement assembly includes 30/8 ring-and-pinion and 20/28 portal gears: (30/8) x (28/20) = 5.25:1. The factory manual identifies 33/8 rear gearing, giving 5.775:1, rounded to 5.78.
  • Replacing the complete rear assembly with 5.25 gearing speeds up the rear by 10 percent relative to its original 5.775 ratio, removing the original gearing bias if the rest of the drivetrain stays unchanged.
  • Retain a suitable existing rear steering servo, horn and links, and follow the URB axle assembly instructions. The supplied kit does not include steering electronics.
  • For a like-for-like repair, transfer the original undamaged 33/8 rear ring-and-pinion or fit its exact replacement VPS08331. Do not describe the off-the-shelf 5.25 assembly as identical stock gearing.

Sources

Vanquish F10W-P complete axle assemblies
  • VPS10568 is the rear-steering assembly, separate from front VPS10567 and non-steering VPS10569. Its 5.25 gearing differs from the original 5.775 rear ratio.
Vanquish URB and URB Ultra factory manual
  • VPS08331 supplies the original rear gearing. The Ultra-only rear assembly is separate from the molded axle kit.