3000 tranny in a 4000?

FordFarmer steered me onto about a 66 4000 with a bad SOS to be auctioned.
We have a 3000 6 speed tranny/rear end here that we can't seem to sell.
So I was wondering about dropping it in place of that bad SOS.
I know the output shaft on a 3000 would be slower as the rear end is only single reduction.
I'm wondering how much slower.
Would a guy have a tractor that would run 8-9 miles an hour? Or would it be slower than that?
I think a slow tractor would still have some value for draft work, etc. But if it would only go 4-5 miles an hour that would be no good.
Where would a guy look to compare those output ratios?
We do have the 3000 flywheel and single clutch to go with the 6 speed. Anyone know if the 3000 splined coupler would fit on the SOS pinion shaft? Could cut and weld that too I guess.
What other surprises would a guy find?
PTO shaft too short?
I know it's kind of a Jerry Rig deal but if a guy could make the old tractor be productive again it might be worth while.
Just reuse the side pump and lines from the SOS.
Any thoughts on this?
Thanks

I know that the 600/601/700/701/800/801/900/901 all share the same transmissions so is there any chance that the 2000/3000/4000 all share the same transmissions? Then all you would need to do is swap out the transmissions and leave the 4000 rear axle in it.

(quoted from post at 17:51:42 02/03/13)
We have a 3000 6 speed tranny/rear end here that we can't seem to sell.
So I was wondering about dropping it in place of that bad SOS.
I know the output shaft on a 3000 would be slower as the rear end is only single reduction.
Thanks

Click to expand...

Well, if you have the whole thing including differential and axles, it's simplest to just connect the good engine half. Then the answer to your speed questions is only a flip through the operator manual away. I seem to remember seeing the 6 speed info and the speeds were similar to the 8 speed. Is it the 6 speed where there's a lower gear in high and a higher gear in low range? Kind of a mind trip when you first see that layout. In my opinion, If you do have the rear axles too, I would just make the tractor out of that also removing any decals that say "4000." You would have a quick and cheap project for resale.

As to component swapping, you're more of the expert with that than I am. you may want to investigate final drive ratios--if it all bolts up you may come out ok. This would be a lot more work (research time) and parts hunting, you may discover you'll need a limited production part that's NLA to make all the parts work together. It does seem every combination you could dream up of a franken-tractor, Ford probably tried the same thing and sold a few to meet special needs, so a weird adaptor part should exist in some era.

Also if you end up a little slow, 38" tires could help make up the difference and may appeal to someone's row crop or clearance needs. Although it would look crazy on a general purpose model.

good luck
karl f

www.alexanderstractorparts.com is a restoration house that has been selling restoration (of whatever degree) parts for 28 years, some of which they personally rebuilt, located in E. Texas.

They have SOS drop in kits consisting of the manual tranny and all necessary amenities.

If you can't find your data elsewhere, give them a call. Surely they will have your answer.

Mark

From my sales literature... 4000 SOS ratio - 30.01:1 final drive. 3000 manual shift ratio - 6.67:1.
Don't think that swap will work. You could make another over-powered 3000 - use the 4000 engine in font of your 3000 tranny/rear.

How do you intend to control the PTO? On the SOS 4000 the PTO was integral to the transmission so you have no controls in the rear end center section....

Rod

Put it together and take it to steam/tractor shows and win at the slow race!

There is the same hole on the left side of the center housing for the pto handle on my 4000 as there is on a 3000. I assumed the pto parts would swap over? Maybe the SOS center housing doesn't have that hole?

I really do't know if it's there or not... Mabey you can add it. I just know the parts are not there as it sits.

I'd also suggest that you check the transmission output shaft ratios... We know that the SOS rear ends have a different ring/pinion because of the SOS's higher output speed. What you might also find is that the 3000 crashbox has an underdrive output ratio... so you ~could~ be compounding a ratio mismatch... Again, I'm only speculating on that as I don't know for certain on that series of tractor. I DO know that on later models like the 10 series the transmission output ratios is what WAS altered to compensate for varying tire sizes and the actual rear end reduction remained the same on all models in a chassis class....

Rod

From what I can see by looking at cutaway photos, the 6 speed and 8 speed look interchangeable, except the 4000 uses a continuous running pto drive that also operates the hydraulic pump. The SOS has a shifter for ground speed pto. From my checking of the 2000 industrial with planetary reduction, the straight through reduction is 16.67 to one. The planetaries are 4.5 to one, thus the ring and pinion check out at 6.67 to one. I also own a 3000 ag. All I can say is the industrial has maybe 50-60% of the speed of the Agricultural. (Not terribly slower.)
I"d have to expect some variation in the ring and pinion. For example, 9 x 60 = 6.67. I don"t have my Gleason manual handy, but ratios from about 3 up to about 9 are not too wild. Just need to adjust the bearings so that the two gears mesh properly.