The wired switches are the isolator switches for an overdrive. The 'bolts' are
probably the blanking plugs for the holes for the isolator switches. (Later
non-OD gearboxes did not have these drilled and tapped, but early ones did.)
Either one should work fine for a non-OD box (but the switches really
should've gone with the OD). ISTR the threads on those switches are one of the
few places metric threads are found on a TR3.
Randall
59 TR3A daily driver
On Wednesday, November 29, 2000 11:52 AM, David A. Templeton
[SMTP:davidt@opentext.com] wrote:
>
> I have 2 TR3a gearboxes for the project. One has a pair of bolts on the top
> rail, the other has wired switches. What is the difference?
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