SD905
Number of speeds
5
5
Gear positions
R-0-1-2-3-4-5
R-0-1-2-3-4-5
Recommended max engine torque
13,5 mm gears: 350 Nm 17 mm gears: 400 Nm
13,5 mm gears: 350 Nm 17 mm gears: 400 Nm
Weight
45.5 kg
45.5 kg
Gear wheel width
13.5 or 17 mm
13.5 or 17 mm
5 speed front wheel drive transmission. Different versions of the SD90 gearbox fit very different cars. Many competitive FWD cars now rely on the superior reliability of the SD90 gearbox.
| Number of speeds | 5 |
| Gear positions | R-0-1-2-3-4-5 |
| Recommended max engine torque | 13,5 mm gears: 350 Nm 17 mm gears: 400 Nm |
| Weight | 45.5 kg |
| Gear wheel width | 13.5 or 17 mm |
| Lubrication | Wet sump. GL5 spec. transmission oil. Tractive recommends SAE 90 gear oil, available from Tractive in 1 L bottles. |
| 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 life and good durability. |
| Cockpit Gear Lever: | ractive sequential shift gear lever with return springs. Two lengths available. |
| Gear Lever and gearbox connection: | Through 8 mm stainless steel rods, either direct or over a bell crank on the prop-shaft tunnel. |
| Reverse gear engagement: | A With clutch ring shared with 1:st gear. Note! No sliding gears, no chips or swarf in the gearbox. |
| Reverse gear release machanism: | 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 mm for all forward gears. |
| Ratios: | Wide range of speed available. See ratio charts. |
| Gear selection mechanism: | Sequential shift mechanism extensivley developed by Tractive. |
| Bearings: | Standard type SKF cylindrical roller bearings for input and output shafts. Ball bearings for selector drums. |
| Bearings in clutch gears: | INA cage type needle roller bearings. |
| 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 on casing: | All parts making up the casing are anodized in black colour using Comptcote process. |
Smooth gear change helps to drive faster
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.
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