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Yes---and yes. you will be able to cruise the highways ok - noisy but ok. And yes that it will be like driving a 5-speed in 4th. The 1980 240 model (I drive an '80 245 w/four speed plus o'drive--the M46 transmission) came with a 3.91 rear axle ratio in either version. For many years the 122 and 140 models carried a 4.10 -- with some models as low as 4.56. If you like it--buy the car and then keep your eyes open for a donor car with O'drive. Everything on a 240 M45 to M46 conversion is straightforward and things fit all through the model years -- especially if you're working on an older model like the '80. -- Dave
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