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HDi fun · 08-05-2008, 07:28 PM

If your Sat Nav coincides with the speedo then you can assume that the speedo is reading correctly.

Final drive is the part of the transmission that governs the overall gearing ratio. It's the final part of the transmission before the driveshafts to the wheels in a FWD car.

For example - assume that 4th gear is 1:1 ie. direct within the gear selection assembly. There will still be a reduction gearing before drive goes to the wheels.

So you might find that the 1.0, 1.1, 1.2, 1.4 etc. Polo's all have the same 5 speed 'box but with the larger engined versions having a 'taller' final drive ratio, thereby making all the gears longer with respect to a Polo with a smaller engine that has a shorter (lower) final drive ratio.

I do think you need to go back to the garage that fitted the g/b as clearly the revs you're taking about are extremely high for 50 odd mph.

Quite apart from fuel usage it must make for bloody tiresome journeys.

08-05-2008, 07:28 PM	#11 (permalink)
HDi fun Moderator The Torque Meister Car: Peugeot 406 Join Date: Apr 2006 Location: SOUTH EAST Posts: 1,526	Re: gearbox ratios If your Sat Nav coincides with the speedo then you can assume that the speedo is reading correctly. Final drive is the part of the transmission that governs the overall gearing ratio. It's the final part of the transmission before the driveshafts to the wheels in a FWD car. For example - assume that 4th gear is 1:1 ie. direct within the gear selection assembly. There will still be a reduction gearing before drive goes to the wheels. So you might find that the 1.0, 1.1, 1.2, 1.4 etc. Polo's all have the same 5 speed 'box but with the larger engined versions having a 'taller' final drive ratio, thereby making all the gears longer with respect to a Polo with a smaller engine that has a shorter (lower) final drive ratio. I do think you need to go back to the garage that fitted the g/b as clearly the revs you're taking about are extremely high for 50 odd mph. Quite apart from fuel usage it must make for bloody tiresome journeys.