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2-Speed Transmission Kit for TRX-4M™ Model Series Traxxas #9891
  • 2-Speed Transmission Kit for TRX-4M™ Model Series Traxxas #9891
  • 2-Speed Transmission Kit for TRX-4M™ Model Series Traxxas #9891
2-Speed Transmission Kit for TRX-4M™ Model Series Traxxas #9891

2-Speed Transmission Kit for TRX-4M™ Model Series Traxxas #9891

$49.95

2-Speed Transmission Kit for TRX-4M™ Model Series Traxxas #9891

Two speed transmission, complete (32.7:1 and 9.9:1 gear reduction ratios) (includes Titan® 87T motor)

  • New drop-in assembly includes motor
  • Adds manually selectable low-range gear for technical crawling
  • Combine with portal axles for the ultimate off-road machine

 

TECH CORNER:

Portal Axle Gearing Options

Installing portal axles adds additional gear reduction for ultimate crawling speed and torque.

The portal axle kit includes optional gear sets to change the final drive rations for more speed if desired.

 
 

Single-Speed Transmission

Red Gears (Optional)

When portal axles are used with the single speed transmission, the additional gear reduction results in very slow crawling speed that may not be desirable for trail running. Install the red gear set (NEW part number 9776A) in the transmission to return the speed back to the stock out-of-box speed.

 
  • Maintains stock vehicle speed
  • Changes overall gear ratio from 16.6:1 to 17.1:1
 

2-Speed Transmission

 

Blue Gears (Recommended)

When portal axles are used with the 2-speed transmission, both low and high range run at crawling speed. Install the blue gear set (existing part number 9776X) to increase speed and performance.

 

 
  • Low Gear: maintains stock speed (19.1:1)
  • High Gear. comparable to existing speed transmission (5.8:1)  Part #9791X
 
 
 
 
 

TRX-4M Portal Axle Support Parts

 

  • 5043 Ball bearings, black rubber sealed (3.5x7x2.5mm) (2)

  • 9830 Axle shafts, rear, portal drive (2)

  • 9832 Portal drive housings, front, inner & outer (left & right)/ caster blocks (portal drive), left or right (2)

  • 9841 Axle housing, rear/ portal drive housings, rear, inner & outer (left & right)

  • 9845 Bushing kit , portal drive housings
  • 9845X Ball bearing set, portal drive housings
  • 9853 Stub axles (portal drive) (2)
  • 9877 Portal drive gear set, front (left or right)
  • 9878 Portal drive gear set, rear (left or right)
 

TRX-4M 2-Speed Transmission Support Parts

 

  • 9776A Gear set, transmission (red)(6.8:1 reduction ratio)/ pinion gear, 11-tooth (for use only with portal drive axles)

  • 9876 Transmission gears, two-speed (for #9891 transmission)

  • 9889 Gearbox housing (front & rear) (for #9891 transmission)
  • 9890 Two-speed shift assembly/ shift dog/ shift fork/ transmission mount/ 2x6mm BCS (4) (for #9891 transmission)

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