3MO TXB 600 Nm RWD Drop Gear Gearbox Specifications

3MO TXB REAR WHEEL DRIVE GEARBOX

600 Nm / 450 lb-ft Drop Gear

RWD 600 6 Speed Drop Gear System

OVERVIEW

The 3MO TXB 6 Speed 600 Nm Sequential Gearbox suits race and high performance street vehicles where the engine is longitudinally mounted in the front or mid positions, and driven through a rear wheel differential. This sequential transmission features a drop gear system with 3 choices of overall drive can be changed over in 30 minutes without needed to remove the gearbox. The Drop Gear System allows fine tuning on the day, and eliminates having to change rear differentials out during the week so you can be setup for a different track next weekend.

With 52 gear ratios to choose from, the dog speed delta between gears can be optimised for lightening quick and almost imperceptible gear shifts keeping the power to the track for the maximum amount of time. When combined with the 3 different drop gear options, there’s a setup for every situation. This highly reliable and precision engineered sequential gearbox delivers ~97% efficiency.

With standard materials, the TXB is rated for engine torque of 600 Nm in Circuit / Road Racing and Rally applications. In Drifting applications, this 6 Speed sequential transmission is capable of handling engine torque of 1200 Nm. This super flexible platform is also available in four wheel drive configuration. With upgraded materials; the torque rating increases to 900 Nm in Circuit / Road Racing applications and 1500 Nm in Drift applications.

With proper shift technique and lubrication; dog rings are designed for 60 hours of racing or 8400km / 5250 miles. Likewise, gear positions 2 and 3 are rated for 50 hours or 7000km / 4375 miles, with gear positions 4, 5 and 6 being rated for 75 hours or 10500km / 6560 miles. These service life ratings assume the gearbox is being run at the maximum torque loading – clearly if the torque is less than the maximum load, then the service life is extended.

Its easy to see why with all this flexibility the 3MO TXB 6 Speed Sequential Transmission is popular with race teams around the world.

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APPLICATIONS

Circuit – Rally – Off Road – Drift – Street

BENEFITS

Strength – Wide Range of Gears – Flexibility – Drop Gear System

GEARBOX IN ACTION

SPECIFICATIONS

  • 6 Speed RWD Sequential Gearbox with drop gear system for 30 minute change of drive ratios with gearbox in situ.
  • Maximum engine torque 600 Nm or 440 lb ft with standard materials and all 1st gear options
  • 20mm / 0.79″ wide gears on 1st, 2nd & 3rd with 17mm / 0.67″ wide gears on 4th, 5th & 6th
  • 89m / 3.5″ shaft centre line distance
  • Rear mounted Drop Gear System with 3 ratios to change between
  • 52 gear ratio options
  • Gear selector inversion lever
  • Splash lubrication
  • Bespoke input shaft length and spline to suit customer requirements
  • 0-5V gear position sensor
  • Lock out cable for reverse gear
  • 36kg / 79lbs

RATIOS

Drop GearsGears
TeethRatioTeethRatio1st2nd3rd4th5th6th
25 x 240.96011 x 403.64     
27 x 24 0.88912 x 373.08     
24 x 200.83312 x 352.92     
  13 x 342.62     
  15 x 362.40    
  13 x 312.38    
  14 x 332.36    
  13 x 30 2.30    
  14 x 322.28    
  13 x 292.23    
  14 x 30 2.14    
  15 x 322.13    
  14 x 292.07    
  16 x 322.00    
  17 x 331.94    
  15 x 291.93    
  17 x 321.88    
  17 x 311.82    
  15 x 271.80    
  17 x 30 1.76    
  18 x 311.72    
  17 x 291.70    
  18 x 291.61    
  16 x 322.00   
  15 x 291.93   
  15 x 271.80   
  18 x 311.72   
  16 x 271.69   
  17 x 281.65   
  18 x 291.61   
  17 x 271.59   
  17 x 261.53   
  18 x 271.50   
  17 x 251.47   
  18 x 261.44   
  19 x 271.42   
  18 x 251.39   
  20 x 271.35   
  19 x 251.32   
  21 x 271.29   
  21 x 261.24   
  22 x 271.23   
  19 x 231.21   
  21 x 251.19   
  20 x 23 1.15   
  23 x 261.13   
  20 x 221.10   
  21 x 231.09   
  28 x 301.07   
  28  x 291.04   
  23 x 231.00   
  25 x 240.96   
  32 x 300.94   
  23 x 19 0.83   

ACCESSORIES

We have an extensive range of gearbox & drivetrain accessories

  • Bell Housings and Adaptor Plates
  • Gear Levers
  • Strain Gauged Shift Cut Knob for Gear Lever
  • Paddle Shift Solutions
  • Breather Kit 
  • Programmable Gear Position Display
  • 52mm hydraulic clutch release bearing + feeder hoses
  • Generic customisable cross member to make fitting faster 

NOTES

  • A minimum 0.7″ master cylinder can be installed on your original clutch pedal.
  • There is no slave cylinder stop, so a pedal mechanical stop is necessary.
  • Must use 75w140 fully synthetic lubricant kept between 90-105 C or 195-220 F. Motul Gear Competition is highly recommended.
  • Oil Capacity is 1.3 Litres or 1.4 Quarts excluding lines and cooler