Upgrading Prop Shaft to O/D

["David Moag" <moag@ix.netcom.com>]

Listers,

I am in the process of swapping out a normal gearbox for an overdrive unit
in my 77 Spitfire. I am planning on using the existing prop shaft, after
having it cut down and balanced, etc. An article I read on the subject
stated that you need to have 2 1/2 inches removed from the shaft. Does this
sound correct to anyone on the list who has done this?

Thanks for any advice,

Dave Moag
77 Spitfire
62 TR3B