Specifications

SPECIFICATIONS

 

3MO REAR WHEEL DRIVE TRANSMISSIONS

500 Nm / 370 lb-ft Ultralight

RWD 500 Ultralight 6 Speed

OVERVIEW

 

The lightweight 27kg / 59lb 3MO TXL 6 Speed Sequential Gearbox suits racing engines using longitudenally orientated, front or mid mounted engines, connected to a rear wheel drive differential. Race car owners spend a lot of time and money taking weight out of their cars, so it makes no sense adding that weight back with a heavy or over sepcified gearbox that's not fit for purpose. The transmission's compact size means driveline tunnels dont usually need to be modifed making fitting simple and easy in a wide range of situations. If your engine develops 500nm or less, then the TXL lightweight and super quick shifting sequentiual gearbox is probably the right choice for you.

This versatile 3MO sequential gearbox has a wide range of 35 gear ratios and 3 driven shaft ratios to choose from ensuring drivers can specify the gearbox at ordering time for their unique needs - in other words; there's a gear ratio for almost every situation. The TXL 6 Speed Sequential Gearbox is capable of handling engine torque of 500 Nm with 1st gear@3.08 and 0.97 input drive (25 x 24) i.e. 2.98. If a taller 1st gear ratio of 2.92 and 0.87 input drive (23 x 20) ie 2.54 are chosen; then torque capability is reduced to 420 Nm.

In Drifting applications, the 3MO TXL Sequential Transmission is capable of handling engine torque of 1000 Nm with 1st@2.98, or 1000 Nm with 1st@2.54.

With upgraded materials; the torque rating increases to 600 Nm in Circuit / Road Racing applications and 1100 Nm in Drift applications.

There are three inspection ports to allow for easy checking of the dog rings without disassembling the gearbox, which saves workshop time.

With proper shift technique and lubrication, dog rings should be good for 60 hours of racing or 8400km / 5250miles. 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. 

This gearbox is also available in 4WD format which you can see HERE  

APPLICATIONS

Circuit - Road Racing - Rally - Hillclimb - Off Road - Drifting

FEATURES

Reliability - Lightweight - Compact Size - Wide Range of Ratios - Flexible Fitting 

 

GEARBOX IN ACTION 

SPECIFICATIONS

  • 6 or 5 speed sequential gearbox with straight cut and dog engaged gears 

  • Maximum engine torque:

      - 500 Nm / 370 lb-ft (1st gear 3.08, constant drive 0.97, i.e. 1st gear global ratio 2.98) in circuit, road racing and rally applications)

      - 1000 Nm / 885 lb-ft (1st gear 3.08, constant drive 0.97, i.e. 1st gear global ratio 2.98) in drifting applications

  • 89 mm shaft centreline 

  • 20mm gear tooth width (1st - 2nd - 3rd) & 17mm (4th - 5th - 6th)

  • Ratio options: 

        - 3 input constant drive ratio options 
        - 35 gear ratio options 

  • Range of input shaft splines

  • Range of bellhouses for most of the popular engines 

  • Splash lubrication

  • 3 dog ring inspection ports

  • 0-5V gear position sensor 

  • Lock out cable for reverse

  • Weight: 27 kg

RATIOS

 

Input Drive Ratios 

Gear Ratios

Gear Position

  Teeth Ratio Teeth Ratio 1st 2nd 3rd 4th 5th 6th
Short 25 x 19 0.760 12 x 37 3.083          
Medium 23 x 20 0.870 12 x 35 2.917          
Long 25 x 24 0.960 13 x 34 2.615          
      15 x 36 2.400        
      13 x 31 2.385        
      14 x 33 2.357        
      13 x 30 2.308        
      14 x 32 2.286        
      13 x 29 2.231        
      14 x 30 2.143        
      15 x 32 2.133        
      14 x 29 2.071        
      16 x 32 2.000        
      17 x 33 1.941        
      15 x 29 1.933        
      17 x 32 1.882        
      17 x 31 1.824        
      15 x 27 1.800        
      17 x 30 1.765        
      18 x 31 1.722        
      17 x 29 1.706        
      18 x 29 1.611        
      16 x 32 2.000        
      15 x 29 1.933        
      15 x 27 1.800        
      18 x 31 1.722        
      16 x 27 1.688        
      17 x 28 1.647        
      18 x 29 1.611        
      17 x 27 1.588        
      17 x 26 1.529        
      18 x 27 1.500        
      17 x 25 1.471        
      18 x 26 1.444        
      19 x 27 1.421        
      18 x 25 1.389        
      20 x 27 1.350        
      19 x 25 1.316        
      21 x 27 1.286        
      21 x26 1.238        
      22 x 27 1.227        
      19 x 23 1.211        
      21 x 25 1.190        
      20 x 23 1.150        
      23 x 26 1.130        
      20 x 22 1.100        
      21 x 23 1.095        
      28 x 30 1.071        
      28 x 29 1.036        
      23 x 23 1.000      

ACCESSORIES

 

  • Bell Housings and Adaptor Plates
  • Gear Lever
  • 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 setup.
  • An adjustable clutch pedal stop is needed as the hydraulic release bearing does not have an output stop.
  • Depending on your application an oil cooler may be recommended.  A 13 row cooler measuring 210 x 98 x 50mm with AN6 inlet / outlet fittings will work well.
  • Motul HD 85W-140 Mineral or Motul 75W-140 Gear Comp Synthetic are the correct lubricants for this gearbox operating at 95-110°C or 203-230°F.
  • Oil Capacity is 0.9 litres or 1.06 quarts excluding oil lines, pump and cooler