Sounds like a good road trip, BBQ, blues and brew! [Pugs, we *have* to do
a brisket or two this year!]
A few years back, I went to look at a TR4. It had an 4A IRS rear end, but
the front was definitely TR4, being basically a TR3 frame with extra box
sections welded to the outside to widen the track. I didn't bother to look
too closely at the center where the two distinct generations of frame must
have met. So, I would say it is possible to mate a TR4 frame to a 4A frame
somewhere in the middle. My concern would be that somewhere down the line
some tech inspector, having a bit of TR knowledge tucked away in the recesses
of his brain, will question the origin and legality of such work.
mjb.
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