Quote:
Originally Posted by stevests
A Ruckstell is an underdrive unit - one can fit a "special" Ruckstell gear set (if you can find a serviceable set) to make a 3.25 to 1 ratio to increase road speed a little but you'll lose your "pulling" ability somewhat.
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The 40 tooth ring is available and will work with the available 12-tooth pinion for a 3.33. I think there is a 39 tooth ring that will work with the 12 tooth for 3.25. The reduction is a planetary set which has some similarity to the later Columbia. The old 13-tooth pinions may be out there but I've not seen any new ones.
Folks that want to get taller gears generally go with an in line gear box type that has an overdrive ratio. With a model T that is stock, it may not do all that well developing higher road speed. Hop the engine up with a larger fuel delivery system, a cam, a more tuned exhaust, and a high compression head and it will develop more power and higher speed capability. Folks that go this route generally do away with the magneto on the flywheel to try and lighten it up. A distributor usually replaces the old trembler coil set as well.
I sort of prefer the old original set up myself. It takes too much work for make a faster car out of a T when a model A is better suited to hot rodding.