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So, I should be able to remove my 1850 BW65 bell-housing, graft it onto the zf-4HP22 and then refit, with a few spacers and aligning issues sorted?
At least the tunnel doesn't become an issue on the dolomite!
Anyone got a 1850 auto box bell-housing that I can experiment with before I take the box out of my car? I have a BMW 320 torque converter on my ZF-4HP22. I need to make sure it fits into the bell housing!
Just an idea (and I am anticipating the usual scoffing) but could you save a lot of hassle and fit one of these in place of the propshaft centre bearing:
http://www.odspares.com/phdi/p1.nsf/sup ... ent&part=4
they are popular with pre war cars where there isn't room in the gearbox tunnel. I haven't been out to look under my car to gauge how much room there is but I would guess this would be less hassle than changing the whole box over - eliminating the torque converter swap (unlike a clutch, they are supposed to be "matched" to the engine torque curve - which may work on a Stag but could be horrible in something with less umph), kickdown and gearchange linkage issues. It's a laycock overdrive so
sort of original too. The only gearbox mod is to run the speedo cable from the overdrive rather than the auto box. The whole thing is reversible in a day or so if you don't like it.
If you're really clever, it must be possible to retrofit the overdrive to an auto transmission. It's been done in the US: