better tractor jd 4320 or jd 4430 September 04, 2015 11:31AM
I am at a bypass in building a new hot farm tractor. I have a john Deere 4320 that I have been slowly transitioning from a farm stock puller to a hot farm or too hot to farm as some call it. My problem is the fuel pump, can't make enough power with the little Roosa to run with the 1066 crowd. Most of the compatition is running 4440's or 1066's. I love the looks of my new generation tractor but all I hear is to sell it before I totally comit to a bigger class and get like a 4430 that already has an a-pump motor in it. Why do I not see many new generation tractors with 466 a-pump motors around? Is it a chassis duribillity issue or just easier to do with the newer series. I will apriciate all thoughts. And no I am not buying a different color. I bleed green. Thanks.
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Re: better tractor jd 4320 or jd 4430 September 04, 2015 11:41AM
why don't you just put in a 466 p-pump equipt motor out of a 4840, titan 2 combine. I've done a few 4320's that way. it's easy to change and then you can realy get some power out of it. We changed cam, pump, injectors on one and no one can tel the difference till you beat them a few times. That is unless someone makes a point of having to have the stock 404 for the sheet metal in your particular class.
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Re: better tractor jd 4320 or jd 4430 September 04, 2015 12:47PM
I have pondered that very rought but I just don't see any others around my parts. I am curios if there is a particular. Reason why. Most of our local pulls have next to no enforced rules so it is possible that is what I do.
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Re: better tractor jd 4320 or jd 4430 September 04, 2015 02:00PM
A 4320 is pretty much a big radiator 4020. If you make over about 600hp it is going to give you troubles in stock form. The 4430 types can go up in the 800hp range before they become a problem and that catches most "farm stocks" with their rpm and turbo rules. Anymore than that and you might as well 3spd it and save the headaches.
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Re: better tractor jd 4320 or jd 4430 September 05, 2015 01:29AM
We have put 3 speed transmissions in both 4320 and a 4430 and the actual transmission in stock form is almost identical on both. The high range pinion is usually the first thing to break on a stock transmission and they both use the exact same part number for the high range pinion. If anything I would say the top shaft of a 4430 is weaker since it has a hole drilled all the way through it for the tranmission pump drive shaft. The differentials on both are also almost identical. So I dont see how a 4430 is any stronger than a 4320 atleast from the transmission back.
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Re: better tractor jd 4320 or jd 4430 September 05, 2015 03:56AM
I believe the only difference that amounts to much is the 4320 has a faster road gear at least vs a 4430 quad so it puts more stress on the trans. a 4430sync vs 4320sync would be the same. I have never seen the top shaft itself be a problem, you either break the teeth off high pinion , shear keys from shift collar or break a syncro drum. Regardless if you make much hp you will be needing another transmission.
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Re: better tractor jd 4320 or jd 4430 September 05, 2015 04:19AM
I agree with everything thing you said. One other thing though is I believe a 4430 quad is under driven when in the low side so if both tractors had the same power, the 4430 quad transmission would see more torque than the 4320 syncro when the quad was in the low side since the quad reduces the rpm of the transmission shaft and increases the torque . It really would be a toss up and either tractor would work fine. The 4430 would definitely look more stock with a 466 than a 4320 just because the roosamaster vs the inline pump is a dead give away . The 4430 also is much easier to fit a larger turbo under the hood. The 4320 would definitely be easier since it already has a dry clutch. The 4430 with a quad would definitely be a plus if you wanted the ability to shift on the fly but then you have the problem of the wet clutch not holding and the quad not holding up..
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Re: better tractor jd 4320 or jd 4430 September 05, 2015 02:04AM
I believe a 4320 is a better way to go.If you go with a 4430 you will probilty change the bell housing to 4020 or 4320 anyway to go with a dry clutch.J&R buildes a good pulling transmission for this set up.Your only limiting factor is under hood space for a good charger,but that can be worked out.Im with J&R on strength,really no difference.
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Re: better tractor jd 4320 or jd 4430 October 17, 2015 01:50PM
Roughly how much power can you put thru a stock 4230 quad or 4430 quad transmission? A lot of the parts are the same. Going in the 3000 rpm class direction.
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Re: better tractor jd 4320 or jd 4430 October 18, 2015 05:50AM
With the pump pressure set up,probilty about 350 to 400 hp.You will start having clutch problems after that.Tranny will hold til you have more power than running 7th, will not hold road gear.You will start breaking gears.
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Re: better tractor jd 4320 or jd 4430 October 18, 2015 03:20PM
Local class doesn't allow P pump in the 3 k. Use a 10 mm A pump. 3lm-466 turbo. So figure from that.
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Re: better tractor jd 4320 or jd 4430 September 05, 2015 04:14AM
If you reasearch this topic on here, you will see i was asking simillar questions. 30/40 series tractors will give you more room under the hood. New gen will give you the dry clutch. I decided to stay with the new gen. Dry clutch is alot easier to build and maintain. You can get creative and put any sheet metal you want or plumb the charger. A factory replacement for you 4320 is going to be 466 A pump. The 404 have been retired. As for the frame rails, all of the are good strong components, find a set from a 4840 and they will have the correct pattern if you want to use a P pump block.
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