Tractive SD90 FWD sequential shift gearbox. The basic layout for RD90 and SD90 gearboxes avoids all major problems related to thermal and mechanical properties of traditional layouts. The main housing of the SD90 casing is, basically, a fully-machined piece of aluminium billet, combining minimum weight with superior mechanical, dimensional and thermal stability.

Tractive SD90 front drive sequential shift gearbox

Tractive SD90 front drive sequential shift gearbox

Tractive SD90 front wheel drive sequential shift gearbox

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. 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 RD gearboxes offer you the best!


Number of speeds: SD905: 5 forward, 1 reverse
SD906: 6 forward, 1 reverse
Gear positions: SD905: R-0-1-2-3-4-5
SD906: 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: SD905: 45.4 kg (depending on type of car)
SD906: 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 whole 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: Hydraulic, integrated in the gearbox.
Clutch rings (dogrings): Tractive standard with 90 mm O.D. with radiused corners for long lifge and superb durability.
Gear selection mechanism: Sequential shift mechanism extensivley developed by Tractive.
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. Coming soon.
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 Viton 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.


Due to its modular design, the Tractive SD90 can be adapted to virtually any engine / car combination without need for new patterns or extensive redesign. SD90 is used in front wheel drive cars. Different versions of the SD90 gearbox fit very different cars. Many competitive FWD cars now rely on the superior reliability of the SD90 gearbox.

Application list, March 2009

Part Number of front cover Car
56050200 VW Golf
56050300 Opel Corsa
56050500 Toyota Corolla 3-SGE engine (2,0 Celica 202 ST & Camray 98-00
56050600 Peugeot

Back to Top Top

Home | Imprint | Contact | Links