Final drive ratio and spinning axle February 09, 2009 11:17PM
On a JD 4020 if I spin the axle shaft and count how many time the pinion shaft off of the differential goes around, that would give me my final drive ratio?
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Re: Final drive ratio and spinning axle February 10, 2009 12:03AM
4010 R&P = 37/6 = 6.167
4020 R&P = 47/9 =5.222
4010 Planetary =1 + 57/18 = 4.167
4020 Planetary =1+ 57/15 = 4.8
Stock 4010 total 25.694
Stock 4020 total 25.067
4010R&P with 4020 axil 29.6
4020 R&P with 4010 axil 21.759
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Final drive ratio February 11, 2009 06:04AM
Will if you only jack up one tire will the pinion gears alter the final drive ratio or do they just act as idler gears?
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Re: Final drive ratio and spinning axle February 10, 2009 12:18AM
You have the right idea,kind of, turn the input shaft one turn and count the axle. Think power in, pwer out.
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Re: Final drive ratio and spinning axle February 10, 2009 03:09AM
Just don't forget your differential will make one wheel go twice as fast, if the other wheel can't turn...
Remember back when a guy figured his single Allison would spin the tires at 96 mph after counting the turns of the pinion shaft after one rotation of the jacked up left rear wheel.. Grinning


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Re: Final drive ratio and spinning axle February 10, 2009 03:45AM
So if I jack up both tires and turn the input shaft 25.067 revolutions my tire should turn once is this correct?
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Re: Final drive ratio and spinning axle February 12, 2009 02:09AM
BOTH tires need to turn. If only one turns, your diff is working and reducing the input shaft rpm by 50%.
Best is:
Jack up one tire, turn input shaft for as long as the tire made one revolution. Multiply the number of turns of your input shaft by 2 - and that's your final ratio.
Like 10 turns on the input shaft make ONE wheel do one turn. Then 10 * 2= 20.
20to1 final ratio


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