4430 - 4240 Quad mod; for faster road speed using 4440 quad

fdt860

Well-known Member
I have read that you can split a 4240-4430, etc, reverse the planets, and install 2 gears of off a 4440 and get a 27% faster tractor.
Have you done that before?
 
It could be possible,the 4430's were direct drive in Hi range and under drive in low range...the 4440's were direct drive in low range and "over Drive" in Hi range, so swapping the Hi/Low planetary could give a 15% over drive to one,,but I have never seen it done,,interesting thought though...
 
It is indeed possible and done frequently by tractor pullers who want to split the gears differently or just go faster. I've done it to two of mine.

Seems that the hardest part is finding the gears out of a 4440, 4450 or 4455. The early straight cut gears you could indeed flip the planets and find the correct gears and away you go. The later ones where helical gears, you generally only see them as a complete unit.

Be very careful if you switch a complete quad out, the later ones have an oil feed port by the shift valve with a square o-ring, if your 4430 has a plug in that spot on the clutch piston housing you will need to remove it otherwise it will not shift one direction and you will scratch your head a long time. It's a 1/16 pipe plug.

You will either need to get the shift lever out of the 4440, 50 or 55 OR you can flip the 4430 on 180 degrees and lengthen the rod. Easier to use the right on, but you do what you gotta do.

Depending on tires it will take a 20 mph road gear and make it about 26 mph.
 
I have heard of doing it but not exactly sure what needs done. Maybe looking at parts books between a 30 series vs 40 series or newer will reveal the part numbers for the gears that need changed. This is not an issue yet In mine as I need more power to stay in c4 or d3/4, im running c3 or d 1/2 in open speed classes now and not maintaining constant speed
 
Thank you all for your advices. Will start to gather parts for the swap. From JDParts, I can see that I may just need a gear and a drum from a 4440 to convert a 4430.
It is not for pulling, it is because the 4430 is used only on the road for tractor rides and hauling wagons, and it would be nice to either go faster, or be able to pull the throttle off to 1700RPM and still run 20MpH.

That being said, if the 4440s are overspeeding the trans, what is different in the trans. between a 4430 and a 4440 so they go at about the same speed? Final drives? Ring gear ratio?
4430 is exact same trans as 4320 (same trans housing PN in JDParts until they put the extended shifters). But 4440 is another PN.

Then, Is it possible to get a Powershift to go faster? What about the hidden gear in the 15 spds? Is is a faster gear, or an exact same ratio than another one and Deere removed it?
 
4440, 4450 and 4455's all have slower final drives than the others. 6.1ish:1 I think, not 100% sure, but close enough. They sped the trans up to reduce the amount of torque going through it and used the higher ratio finals to get the load off the trans. The same reasoning with going from 540 to 1000 rpm pto, same torque with almost double the power.

4.8:1 is what all the others were, 4020 through 4255.

4010 is 4.16:1 on the final and this is another way to make one faster, but you'd need to figure out which brake parts to use to make it work.

Not sure on the power shifts, but there is a set of gears that connect the trans to the bevel pinion on the 8 speed power shift that is different from the 4440 to 4240/4430, it might speed up the bevel pinion a similar way. Not sure on the 15 speeds, never really messed with them, but I believe the missing gear is a ratio overlap.
 
I knew the 4455 finales were different, but I did not knew that they were going all the way back to the 4440. Now it makes sense why the Hi-Lo is different.
 

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