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!
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