4010 FINAL DRIVES ON A 4020 DEERE February 23, 2011 05:36AM
COULD SOMEONE TELL ME WHAT THE RATIO % FASTER WOULD BE OR TELL ME HOW TO CALCULATE THIS
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Re: 4010 FINAL DRIVES ON A 4020 DEERE February 23, 2011 08:33AM
4010 are 4.16666 & 4020 are 4.8 so about 15% faster. For example factory road gear would go from 22:1 to about 19.1:1
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Re: 4010 FINAL DRIVES ON A 4020 DEERE February 23, 2011 08:56AM
I HAVE BEEN TOLD THEY ARE 6% FASTER I HAVE BEEN TOLD 13% AND NOW 15%
SO HOW DO COME UP WITH THIS FIGURE?
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Re: 4010 FINAL DRIVES ON A 4020 DEERE February 23, 2011 03:20PM
I don't know where the 6% came from, but the 13 & 15 are really a difference in how you look at it & essentially both right.

First, as to how you figure it:
Ratio = 1 + (# ring gear teeth / # sun gear teeth)

for the 4020 = 1 + (57/15) = 4.8

for the 4010 = 1 + (57/18) = 4.166666667

Note that if you take 4.8 / 4.16666667 = 1.152. 1-1.152 = 0.152 so you could say that the 4020 has a 15.2% higher ratio than the 4010. If you take 4.1666667 / 4.8 = 0.868. 1-.0868 = 0.132 so you could also say that the 4010 has a 13.2% lower ratio than the 4020.

When it comes to speed everything flips.
Assuming 3000 engine RPM the 4020 axle speed in 8th gear is 136.1 RPM. If you switch to the 4010 axle housings the axle speed changes to 156.8 so your axle speed is (156.8-136.1)/136.1 = 15.2% faster. (156.8/136.1)-1 is mathmatically the same.)

Hope this helps.
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Re: 4010 FINAL DRIVES ON A 4020 DEERE February 23, 2011 02:26PM
If you are running a 4020 now and you put 4010 finals on it, it would speed it up about 13%.

4020 ratio 4.8
4010 ratio 4.16666

4.8 - 4.16666 = .63334

.63334 / 4.8 = .1319458

multiply .1319458 x 100 to convert decimal to % = 13.19458 %

To check this

4.8 - (13.19458% of 4.8)

4.8 - .6333398 = 4.1666602
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Re: 4010 FINAL DRIVES ON A 4020 DEERE February 24, 2011 03:13AM
What is the benefit of doing this?
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Re: 4010 FINAL DRIVES ON A 4020 DEERE February 24, 2011 08:31AM
what about 4010 axles on a 4430? what is the difference?
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Re: 4010 FINAL DRIVES ON A 4020 DEERE February 24, 2011 10:15AM
Does anybody know what the rear end ratio is on a 4320?
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Re: 4010 FINAL DRIVES ON A 4020 DEERE February 24, 2011 12:02PM
It is the same as a 4020. There are only 3 speeds for small frame waterloo tractors, 4.166, 4.8, and 6.17 like on a 4455
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Re: 4010 FINAL DRIVES ON A 4020 DEERE February 25, 2011 01:56AM
Can anyone explain if it is better to have faster a final drive gear ratio vs a slower one?
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Re: 4010 FINAL DRIVES ON A 4020 DEERE February 25, 2011 07:01AM
Faster is better if you have enough horsepower to run a faster speed. It also depends what weight class you're running. More weight means you need more horsepower.
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Re: 4010 FINAL DRIVES ON A 4020 DEERE February 25, 2011 07:16AM
wonderer- I probably did'nt give you a very good explination so i'll try again. Every puller wants to pull the skid as fast as possible, the momentum will give you a little extra distance on the far end, and sometimes it does'nt take much to put you in the winners circle. One of the ways to get speed is to have a faster rear end however coma when you start increasing speed you increase the amount of power needed to achieve that speed. I don't have any data to back this up but to me doubling your ground speed takes more that double the horsepower, maybe three to four times. So fast is good if your tractor can physcially pull the skid at the speed you want to go.
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Re: 4010 FINAL DRIVES ON A 4020 DEERE February 25, 2011 07:45AM
Can't you achieve the same thing by changing the gear ratio in the transmission and not at the final drives? So what is the advantage speeding up the finals vs on the front side? In the end you still have the same gear ratio: input shaft to tire revolution.
Thanks
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Re: 4010 FINAL DRIVES ON A 4020 DEERE February 25, 2011 07:52AM
You are correct,you can change the transmission gearing to speed up your tractor, but I was just responding to your question about rear end speeds.
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Re: 4010 FINAL DRIVES ON A 4020 DEERE February 25, 2011 12:46PM
Speeding up the transmission while using a slower final is the better way to go. Just like you don't see mod4x4's running 2.73 gears instead they run 6.17 or deeper. This puts the biggest torque load on the axles. There are two axle shafts to share the load on a tractor, but only one transmission input shaft, so it is best to spin it and the transmssion as fast as possible and let the final drives give you your final reduction. The reason putting 4010 finals on is a common way to increase speed is because it can be done with stock parts so it is fairly cheap. Increasing speed in the transmission typicaly requires several custom one off parts instead.
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Re: 4010 FINAL DRIVES ON A 4020 DEERE February 25, 2011 01:11PM
If the faster 4010 finals are harder on transmission pieces, then why would you want to use them?
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Re: 4010 FINAL DRIVES ON A 4020 DEERE February 25, 2011 01:44PM
I agree that 4010 planetaries put a greater stress on transmission parts but I feel that they reduce power losses in the rear end. So if the transmission will hold up using 4010 planetaries you are probably better off with them.

Most pulling tractors that are running any kind speed at all will have to overdrive the transmission using 4020 planetaries. This will mean that the pinion shaft is actually going faster than the engine. Depending on your gear ratios, you will probably still need to overdrive the transmission even using 4010 planetaries but not nearly as much as using 4020 planetaries. The faster the pinion shaft turns, the faster the ring gear will turn. The large ring gears in a John Deere take alot of power when they are slinging oil at high speeds. So I feel that anything you do to slow down the ring gear saves power.
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