[Chris St Leger-Harris]

Hi Hilly,

Thanks for all the info. I was tempted to use an Audi Tdi 'box since i assumed they would be more available, easier to bolt straight to the engine and would be strong as already build for high-torquer applications. The only thing that put me off was the diesel gearing.

I have done some rough calcs and plotted gear speeds versus road load curves and they should be at the bottom of the post. The TDi gearbox will have a 6th gear that will not have much use beyond cruising and increasing fuel economy. Would be very useful if i had a desire to go beyond 200mph though!

Out of curiousity what is the vehicle that the engine/gearbox combo is being levered into? Many thanks once again,

Cheers

Chris