Thanks for all the replies. FWIW, the Moss catalog shows a stay rod fitted
to all TR's through the 4A (with a design change at TR3: TS13046).
That's a good point about the flange thickness. Next time I have it on
jackstands, I will check.
67 TR4A CTC76829LO
> I had the misfortune to operate a TR3 Transmission without that stay rod
> some amount of time and finally the bell housing cracked for about 12
> inches all
> the way around the curve of the bell housing and ruining the transmission!
> I believe that the use of this stay rod brace was eliminated on later
> transmissions. If you measure the thickness of the bell housing flange
> bolts to the engine, it is about 3/8 of an inch thick on the early
> but close to 1/2 inch or more on the later transmissions! Much stronger! I
> know when this change occurred, but my guess is it changed when the gear
> went to a synchro 1st gear.
> My TR250 does not have a stay rod however, I can't speak with any
> about the TR4. But if you measure the thickness of that flange and it is
> inch you are pretty safe!
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