Gearbox parts advice with o/d conversion

[Roger K]

Could I crave a little more advice, please?

Fitting an overdrive gearbox to my late MkIII GT6.  A few questions:

1 - which speedo cable do I need?  All I can find in the catalogues are lengths, which don't say what application goes with which cable.  Looking in my factory parts book, there doesn't seem to be a different one for overdrive cars, so are they both the same - o/d and non-o/d?

2 - I have, in the pile of bits, an 'uprated' overdrive switch lever to sit on the end of the selector shaft and work the switch.  This seems large and clunky, and I can't see an obvious way to fit it, although there is a threaded hole presumably for a lock screw.  Is this worth fitting, or should I just stick to the standard bit of folded steel?

3 - Where should the Lucas 6RA relay for an overdrive car be mounted?

4 - I vaguely remember reading somewhere that the original right-angle speedo drive needs a washer behind it when mounting to the overdrive.  Did I imagine that?  The one that came fitted to the gearbox is clearly old, but has no washer between it and overdrive.

Thanks all!

[johny]

Is it the standard 3 rail gearbox with D type OD youre fitting Roger?

[Roger K]

Yes, completely standard, D-type.

[Pete Lewis]

speedo  cable  V2   https://www.canleyclassics.com/?catalogue=triumph-gt6-mkiii&diagram=triumph-gt6-mkiii-overdrive-kit

or   rimmers https://rimmerbros.com/Item--i-GSD115

yes 7/16 dia washer to make sure the angle drive has no pre load   eg (any washer that fits )

Rimmers  Note:
Washer 538532 required to be replaced at same time to validate warranty

see here  chassis mount plate and rear mount   https://www.canleyclassics.com/?diagram=triumph-gt6-mkiii-overdrive-kit

switch mount braket fits on the top cover front bolts  switch ,extended remote rod and the cam lever to operate the switch

https://www.canleyclassics.com/?catalogue=triumph-gt6-mkiii&diagram=triumph-gt6-mkiii-overdrive-kit-continued

^RA can go where ever you fancy  normally by the coil /battery zone  but inside is away from moisture 

Pete