TRAXXAS XRT 8S Drivetrain Spur & Input Gear XRT3320S by GPM  [XRT3320S]

TRAXXAS XRT 8S 20crmnti Steel M1.5 Spur Gear 33T+Transmission Input Gear 20T (1.0 Mod) - GPM XRT3320S
Price:
£27.81
Brand:
GPM
Model:
XRT3320S
Condition:
Brand New
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Upgrade kit: spur and input gear for TRAXXAS XRT 8S

The aftermarket set couples a 33-tooth spur and a 20-tooth transmission input pinion on a reinforced 7075 aluminium mount with bearing support. The gears are made from 20CrMnTi steel and the mount layout creates a three-point support intended to reduce transmission flex compared to two-point mounting arrangements.

Assembly notes: the motor gear is integrated with the input shaft design to eliminate the separate 2.5mm locating pin used on some stock components. The package contains shims and a bearing to aid correct endplay and mesh setup. Spur specifications are module 1.5 with a D-shaped motor bore and a 14mm face; input gear is module 1.0 with 20 teeth.

Included Items

  • Spur Gear 33T M1.5 - 1 pcs
  • Transmission Input Gear 20T (1.0 Mod) - 1 pcs
  • Aluminum 7075 Mount - 1 pcs
  • Bearing 6x13x5 - 1 pcs
  • Shim 6x8x3.5 - 1 pcs
  • Shim 6x8x7.5 - 1 pcs
  • Set Screws 5x5 - 1 pcs

Original Name / Part No:

7785X,7786X

Confirmed Compatible Models

  • TRAXXAS 1/6 4WD XRT 8S-78086-4
  • TRAXXAS 1/5 X-Maxx 8S MONSTER TRUCK-77086-4
  • TRAXXAS 1/6 XRT Ultimate 8S-78097-4
  • TRAXXAS 1/5 X-Maxx 8S Ultimate-77097-4

For UK customers refining drivetrain robustness or replacing worn components on the listed TRAXXAS 1/6 and 1/5 models, this hardened steel gear set and 7075 mount give improved support and life expectancy; verify compatibility and do not fit to the excluded TRAXXAS 1/5 X-Maxx 8S Monster Truck-77096-4.

Will this kit change gear ratio or performance?

Tooth counts are 33T spur and 20T input, matching the stated modules; the kit is designed as a direct gearing replacement so ratio should remain as original unless you change sprocket counts.

Any special steps for setting mesh?

Use the supplied shims and the included bearing to achieve the correct endplay; begin with minimal shim and increment until you get a smooth, slightly loaded mesh without binding.

How does the three-point mount affect alignment?

The three-point mount reduces lateral play by securing the input shaft with an additional support point, which helps maintain alignment under load compared with two-point mounts.

Is this suitable for high-power 8S setups?

The hardened 20CrMnTi gears and 7075 mount increase durability for high-power use, but monitor mesh and bearings regularly under extreme loads.

What is included in the delivery?

Delivery includes the 33T spur, 20T input gear, aluminium 7075 mount, one 6x13x5 bearing, two shims (3.5 and 7.5), and a 5x5 set screw as listed above.

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