M2 Automotive
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Tractive RD90 RWD 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 RD90 rear wheel drive sequential shift gearbox
The RD gearboxes 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!
Specifications
| Number of speeds: | RD905: 5 forward, 1 reverse RD906: 6 forward, 1 reverse |
| Gear positions: | RD905: R-0-1-2-3-4-5 RD906: R-0-1-2-3-4-5-6 |
| Recommended max engine torque: | 550-600NM |
| Weight: | RD905: 30 kg RD906: 35 kg |
| 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: | Not integrated with the gearbox. Usually fitted in the standard bellhousing. |
| Clutch rings (dogrings): | Tractive standard with 90 mm O.D. with radiused corners for long life and good durability. |
| Gear selection mechanism: | Sequential shift mechanism extensivley developed by Tractive from Honda MX-bike origins. |
| Cockpit Gear Lever: | Tractive sequential shift gear lever with return springs. |
| Connection between gear lever and gearbox: | Through 8 mm stanless steel rods, either direct or over a bell crank on the prop-shaft tunnel. |
| 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 reverse gear. |
| Gear wheel width: | 17 mm for all gears. |
| Ratios: | See Ratio charts. Coming soon. |
| Drop Gears: | The RD905 and RD906 gearbox have a drop gear arrangement to compensate for various rear axle ratios, or to fine tune the top speed and acceleration characteristics. Two gear situated behind a cover at the rear of the gearbox are easily replaced to alter the overall ratio of the gearbox. 13 different drop gears are currently in production. |
| 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. |
| Lubrication: | Wet sump. A GL5 spec. transmission oil is recommended. |
| Seals: | Nitril as standard or Viton alternatively PTFE-lipped low friction seals on request. |
| Shot peening: | All gears and dogrings are shot peened unless otherwise specified by the customer. The cost for shotpeening is included in the quoted price. |
| Surface treatment of casing: | All parts making up the casing are anodized in black colour. |
Applications
Due to its modular design, the Tractive RD90 can be adapted to virtually any engine / car combination without need for new patterns or extensive redesign. RD90 is used in rear-wheel drive cars. Different versions of the RD90 gearbox fit very different cars, from MKII Escorts with some 220Nm to V8 engined cars with 900Nm of torque. RD90 gearboxes are now fitted to most front runners cars in the domestic series, winning events in the Swedish Championship.
Application list, March 2011
| Part Number of front cover | Car |
| 58310500 | Volvo M45 |
| 58310700 | Ford type 9 |
| 58311100 | Ford ZF |
| 58311400 | BMW 320 compact |
| 58311500 | Camaro |
| 58311600 | Toyota Corolla twin cam |
| 58311700 | Ford Cosworth 10 deg left tilt (ex right) |
| 58311800 | Ford Cosworth 10 deg right tilt (ex left) |
| 58311900 | Ford type 9 right tilt 7 deg (ex left) |
| 58312000 | BMW M3 Getrag |
| 58312100 | BMW ZF |
| 58312300 | Ford MT75 |
| 58312400 | Opel Kadett / Ascona CIH engine |
| 58312500 | Ford type 9 left tilt 7 deg (ex right) |
| 58312600 | BMW 6cyl M20/M50 |
| 58312700 | Nissan Skyline manual box R32,R33,R34 |
| 58312900 | BMW vertical V6 M20, M50 |
| 58313000 | Ferrari Maranello 550 |
| 58313100 | Mercedes ”Tobias” |
| 58313200 | Mazda Wankel |
| 58313300 | Universal quick change |
| 58313600 | Universal quick change offset lug |
| 58313700 | Toyota 1600 |
| 58314200 | Mercedes DTM |
| 58314400 | Nissan 350Z G35 |
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