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Just to clarify my earlier statement - and to reply to George:
Neither the M41 nor the M46 "were made to lean at an angle", George - but I *think* what you meant to say is that since the M46 was (almost) universally used with a tilted-over engine (B17/19/21/23/230) the bellhousing was fashioned in such a manner to mate the tilted over engine with the upright transmission.
More about the one exception:
We commonly know that the B20F was fitted to the 1975 US 240 - with an M40/41 or BW35.
BUT... in some other markets, 240s were fitted with the B20A (single carb) OHV engine through the 1976 model year. To the best of my knowledge, they were low-line 240L models that were never seen in North America.
AND... by 1976 the M40 transmission was old hat and no longer available in quantity. So a VERY small number of 1976 240 were fitted with the B20A and the M45 transmission (that's the M46 without the overdrive added - a true 4-speed).
The installation required a special bellhousing. They're incredibly rare - I'd bet only a few thousand were ever installed. I've seen pictures; a few of our European friends have managed to find these and installed them in various 544, 122, 1800, and 140 models to fit the modern M46 (or the true 5-speed M47) into vintage models.
I find it highly unlikely that one of these rare bellhousings found it's way to the states and into a plebian 145. But anything is possible!
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'73 142, '75 242, '75 245, '80 245, '83 244, '86 244, '87 745T, 92 244 (for sale)
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