Dang Anrdew, that was quick - Thanks. If it's heavier I may buy a used 140 xmission (costs more) to rebuild. Heavier might explain the R11 to R21 difference in the part No. for the xmission shaft.
Now about the gearing - Sup A 1st & 4th gears have 16 and 37 teeth on the xmission shaft, and 45 and 24 on the pinion shaft. 140 1st & 4th gears have 14 and 37 teeth on the xmission shaft, and 47 and 27 on the pinion shaft.
If I calculate the ratio of pinion shaft rpm to engine rpm I get:
Sup A 1st & 4th = 0.355 and 1.540 140 1st & 4th = 0.298 and 1.37
Unless there is a difference in gear teeth in the differntial/bull gears etc (which I don't think there is), the super A would be 19% faster in 1st and 12% faster in 4th than a 140. One of my 140's is alot slower in 1st than the other, so I'm thinking the other must have 1st gears from a super A. Of course I could be missing something and totally wrong in all of this.
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