Agreed that installing an M47 in place of an M45 would relatively straight forward (except for the connection at the driveshaft---M45-U-joint---M47-the Guido(?) type joint). But I thought the question in your last post had to do with fitting an M40/41 to the M45 bellhousing. I can't really comment about your rear axle ratio except that all the owners manuals I have for 740 and 240 models show only 3.31 -- with some offering 3.54 as an alternative. One thing I did notice is that 5th in the M47 is a tighter ratio than OD with the M46 by a few decimal points.--Dave
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