Quote:
Agentx66x wrote:
Does anyone know where I can find the gear ratio info for the 1937 115C?
AgentX66X, one easy way to ascertain an excellent approximation of gear ratio regardless of who has changed what over the last 73 years is to jack up one wheel leave the other on the ground (or so it will not turn) and mark the wheel and driveshaft. Note the position of both marks. Rotate the wheel two full revolutions and count the turns of the driveshaft.
If you turn the wheel twice and note the driveshaft turns approx 4 and 1/3 turns, it is likely as O-D points out the standard 4.36:1 ratio. 4.5 turns, then it is the 4.54:1 ratio... you get the picture.
Why one wheel of the ground? The Spider gears are a 2:1 reduction. axle:pinion
Of course if for some reason the third member is out of the axle housing presently, count the number of teeth on the ring gear and divide by the number of teeth on the pinion (driven / drive) and you will have the gear ratio.
This combined with the info provided above should help verify the ratio presently in your car.
Jim
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