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Driveline / Re: Peerless 700 Gear Ratios?
« on: November 27, 2019, 11:31:34 am »I think there seems to be some misinterpretation here.
When the previous posters were talking about 1:1 ratio, they are referring to one specific pair of gears in their trans, one each on the mainshaft and countershaft.
One will have the shift keys and the other will have the gears splined to be stationary on the shaft.
I did a parts lookup on your model transaxle you specified, and going with the same numbers as others running 700's, 4th gear in yours would be the 1:1 ratio. Your model then has a 3:1 reduction with the input. Then 16.5(total ratio of your 4th gear) divided by 3(input ratio) gives you a rear end ratio of 5.5 to 1.
The reason you didn't reach a 1:1 with any gear is that you calculated your total ratios from the input to the axleshaft, which includes the reduction of the input/bevel pair, and the extra reduction from the countershaft to the differential.
Take all the extra reductions out and we can figure the ratios of the 5 gears/reverse themselves.
1st- 3.03:1
2nd-2:1
3rd-1.21:1
4th- 1:1
5th-0.72:1
reverse-2.42:1
Now, there isn't anything wrong with having figured out the overall ratio here. If you are running a transaxle, which I take it you are, you can use the numbers you have to adjust your pulleys to fine tune your gearing based on track size.
Yes, I suppose I misunderstood the intent with that. I just assumed that the total ratio would be the most useful information so my chart shows the total ratios. I don't know what use beyond the whole transaxle as a unit, people would have for individual gear set ratios, unless we are changing the internals around. I more or less wanted others to know the pitfalls of counting rotations on the bench with an open diff and how it will muddy the results compared to what it should be, and also give a rough idea of what to expect for total ratio for selecting a pulley.
Thanks for the clarification on that,
-Josh
*edit, I went back and read through the whole thread and it makes a lot more sense now, Thanks!