GEARBOX & DIFFERENTIAL 32
GEARBOX information
The F305 car mounts a Hewland 6 speed sequential gearbox, it is an updated version of the FTR-
200. The crown-wheel and the differential casing are new. Only use the specific tools to ensure
proper maintenance. Hewland has written a technical manual, including a spare parts list, for the
FTR-200. The manual is available at Hewland. To receive a copy you can contact the commercial
office at Hewland by e-mail: sales@hewland.com
To take the differential out you first need to take remove the LH-side outer tripod housing which is
locked with a wire ring (circlip type fitting) inside the RH tripod housing. We build a specific tool,
available at Dallara’s stores.
To open the differential you have to remove the bearing in order to reach the bolts of the casing
cover. Use proper tools in order to avoid damaging the bearing and the diff cover.
IMPORTANT BASIC INFO
• The mandatory standard Dallara crown-wheel & pinion ratio: 12/34
• Total oil quantity for diff and gearbox: 2.5L
• Oil type: SAE 80 or 90
• Pinion bearing nut tightening torque: 176Nm (130lbs.ft)
• Pinion shaft nut tightening torque: 135Nm (100lbs.ft)
Other information
• The new car is homologated with the 2005 Dallara F3 FTR version of the differential casing
and the light weight crown wheel only. Do not use these parts from the former F302/3/4 car.
• The use of the new Pankl gearbox is possible on Dallara F305 cars. Dallara did the
homologation test also with the Pankl gearbox. Inform at your National Authority for specific
regulations regarding the use and choice of the gearbox as there may be restrictions.
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