> I was over at a friends house on Friday - he's getting ready to put a
> TR4 transmission in a TR3. Looks like there should be no problem
> installing the physical unit.
There are a few. The TR4 box is slightly longer, he will need to slot the
holes in the rear crossmember. The difference is only about 3/8" so it is
possible to force it in otherwise, but it will strain the motor mounts
enough to lead to early failure.
The tunnel will need to be modified to clear the starter bulge.
> Does anyone know if there is a difference in the lower half of the TR3
> to TR4 shift levers?
Seemed to work OK for me, but that was a long time ago and I may have
forgotten a detail.
> If it is different - is it possible to transplant the top cover by
> swapping the reverse rail between the two transmissions?
At least the 1-2 rail also has to change; I changed all 3 of them. The main
advantage, to me, was being able to keep the dipstick. Also a good time to
replace the seals on the shift rails.
> I may be doing a similar transplant in the future myself.
I have a later TR6 box in my TR3 (originally installed in the 3A after the
TR4 box broke). It presents a few more challenges, but nothing that can't
be overcome.
-- Randall
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