[Fot] Triumph GT6 Transmission conversion to TR6?

[Scott Janzen]

Having just munched the third transmission in about two years, I'm  
ready to upgrade to something beefier, but would like to keep it in  
the Triumph family, and need a vintage compliant 4 speed (no 5 speeds  
need apply!).

I'm thinking about a TR6 box, and have started the thought process by  
lining up a TR4 box that I have next to the GT6 box - bell housing  
shape is identical, except that the TR4 box places the starter about  
1/2" higher.  Shifter falls in the same place, though a shorter drive  
shaft and a modified rear mount will be needed as the overall  
transmission is about 4" longer.

The 4's input shaft is a larger diameter - is the TR6 box different in  
that respect from the TR4, given that the TR6 and GT6 engines are  
stroked/de-stroked versions of each other?

If anyone has done this swap, what other clutch, flywheel and  
hydraulics changes have you made? Can you use a TR6 engine plate or  
does one need to be made up?   Lastly, does anyone have a TR6 box they  
want to get rid of?

Thanks!