> Tr4 gearbox in a TR3A?
>
> Been there, done that wrote a web page
>
> www.tjwakeman.net/TR/gearbox_swap.htm
TeriAnn, are you sure about the TR6 gearbox being longer than the TR4 ? I
know the front flange is thicker (as well as the rest of the case), but I
thought the flange to flange dimensions were the same.
There were actually several steps where the case got beefier. I don't know
all the change points, but I believe one of them was during TR6 production,
perhaps when they rationalized with the Stag gearbox. The Stag case was
still machined differently for the roller thrust bearings, but I believe the
castings became the same.
Anyway, the case of the gearbox in my TR3A originally came from a TR6 and I
just elongated the holes in the rear cross member to make it fit (along with
all the other mentioned modifications). I didn't have to unroll the edge of
the crossmember.
Randall
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