SD90 FWD sequential shift gearboxes

The SD gearboxes for front wheel drive cars have a very consistent, smooth and reliable shift mechanism, and consequently dog ring life is exceptionally good. The efficient gear shift will help you drive faster.

The casing from a billet of air craft quality aluminium, forms a light and very rigid unit. High quality precision ground gears gives an excellent life time of the gearbox with minimum maintenance. Read more (link to manufacturing)

Maintenance is very simple as the layout allow for the complete gear set to be removed from the car in just a few minutes.
Proven reliability and winning performance, the SD gearboxes offer you the best!

  • Specifications

  • Applications

  • Tech info

  • Ratio charts

  • Inquiry

  SD905 SD906
Number of speeds: 5 forward,
1 reverse		 6 forward,
1 reverse
Gear positions: R-0-1-2-3-4-5 R-0-1-2-3-4-5-6
Recommended max engine torque:  600 Nm for 17 mm wide gears, 450 Nm for 13.5 gears.
Weight:  45.5 kg   46.0 kg (depending on type of car)
Housing design: A symmetric design ensures thermal stability and a uniform deflection of the housing during high loads. A natural and favourable load path is designed into the gearbox layout.
All parts are machined from high tensile air craft quality aluminium. No castings are used whatsoever.
Clutch shaft: A separate clutch shaft drives the input shaft via a splined coupling. Different lengths and spline configurations are possible. The standard Ford 1”-23 spline is preferred for a shorter lead time, while we certainly can make any type of spline to any type of clutch.
Clutch release mechanism: Hydrulic, integrated in the gearbox.
Clutch rings (dogrings): Tractive standard with 90 mm O.D. with radiused corners for long lifge and superb durability.
   
Cockpit Gear Lever: Tractive sequential shift gear lever with return springs.
Connection between gear lever and gearbox: Through a steel tube from the gear lever to gearbox.
Reverse gear engagement: With clutch ring shared with 1:st gear. Note! No sliding gears, no chips or swarf in the gearbox.
Reverse gear release mechanism: A separate lever on the gear lever must be operated to release engagement of neutral and reverse gear.
Gear wheel width: 17 or 13.5 for all forward gears.
Ratios: See Ratio Charts.
Gear selection mechanism: Sequential shift mechanism extensivley developed by Tractive.
Bearings: SKF cylindrical roller bearings for input and output shafts. Ball bearings for selector drums.
Bearings in clutch gears: INA cage type needle roller bearings.
Lubrication Wet sump. Please use Omega 690 or minimum a GL5 specification transmission oil.
Seals: Nitril as standard or Vition alternatively PTFE-lipped low friction seals on request.
Shot peening: All gears and dogrings are dual shot peened.
Surface treatment of casing: All parts making up the casing are anodized in black colour using the Comptcote process.




Testimonials


Leif Peterson, is arguably the most succesful 2WD rally driver in Sweden and a 2008 and 2009 double champion, winning the Swedish Cahmpionship out-right – and the Supercup, the most prestigious series below the Swedish Championship:



“I have used the Tractive SD905 gearbox for many years now, first in my Golf and later in my two Toyota Corollas. Its reliability and the diff characteristics contributed greatly to the success we have achieved, this year and in the past”.