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Don't rule out the '85 and earlier 240's M46/J-type for experimentation.
A friend had swapped 3.73 for 3.31 in his '82 242 after a blown M46 third gear and Gutrag(sp) swap, so I asked for his drive gear just to see if it was the same shape and if it would work in my M41 J-type.
Pink in color, perhaps originally red? Sorry, I don't remember the tooth count, it's written down somewhere, but all the other gears I have, black and green, are now marked and accounted for.
My 122 sedan now has 3.73 (LSD) and an accurate speedometer!
3.73's a little long-legged, 3.93 is was not available for my axle-shaft tooth-count.
I think the D-types have the same drive-gear configuration as M40's, like B20Paul mentioned, which would it make it much too short for the M41.
Best,
Shayne.
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