Posted by Janicholson on June 10, 2012 at 05:43:04 from (96.24.99.126):
In Reply to: farmall h gears posted by AARON ANDERSEN on June 09, 2012 at 19:08:44:
I agree with Pete. If there is one thing true of Letter Series (and others) it is that it is way difficult to lower the gear ratios. Building a reduction set of gears to go into the torque tube in place of the clutch shaft. (what a TA does, but less sophisticated, and not shiftable) would be one way. The other would be to modify the output shaft to a 20% smaller pinion, and a matching ring gear with that tooth ratio. The pinion could have its teeth ground off, then new teeth hobbed into it smaller. The ring gear would need to be either a new blank machined to match, , or from Boston Gear and taylor the pinion to match the teeth on that bevel gear. Either way the ring would be thicker to allow for the geometry of the reground pinion. IIRC the first gear used on the low speed first gear transmissions have first cut into the shaft itself to get it small enough to work. The strength requirements of any solution in front of the existing trans is much smaller than after reduction through the trans. Jim
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