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Is an M41 tranny just an M40 with overdrive? 1800

posted by  122 and 940 and too many on  Tue Sep 17 20:56 CST 2002
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last visit: Mon Apr 25 13:12 CST 2011
[RELATED]

The gearbox internals are the same in terms of gears. The major difference is that the mainshaft in an M41 is longer in order to drive the overdrive. There is nothing to stop you repairing a worn out gearbox with better internals from an M40 providing the mainshaft in the M41 is OK.

Be aware though that very late M40/41 boxes were different. They had a bigger layshaft axle, revised reverse gear design and altered ratios. If you get an early box you cannot fit those internals into a late case or vise versa. You could however fit the late mainshaft to the earlier M40 keeping gears, layshaft assembly and case together.

Mainshafts for D and J type overdrives are different, so the mainshaft needs to match the overdrive. An 1800ES uses a J type OD.

The collar that takes the overdrive will physically fit onto any age of box.


Regards


Pete






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