Select o speed 4000, 4 cylinder

makoman

Member
What are my options if I wanted to swap tyrannies with a 4 or 5 speed. 800,801 fit? How difficult to find one and how much would I expect to pay?
 
At some point the output coupler splines were different. I'm not up enough on it to know when, but know the SOS had the later one.

BTW, being an SOS guy, I can't imagine y one would wish to do this kind of a swap. :lol:
 
Easier to swap the entire rear of the tractor from the clutch back due to the differences in PTO setup. I believe that you would need the flywheel from the donor tractor as well. Plus swapping the entire rear half gives you a wider range of donor tractors as they changed from the coarse splines to the fine splines at some point and you would be limiting your search to fine spline tractors as donors since that's what your 4000 should have, but if you're swapping everything from the flywheel back then it doesn't matter.

You should be able to find a 800 or 801 series tractor with a blown engine fairly readily. I see that you're in New Jersey. You might want to check with Wengers of Myerstown PA. They are a tractor salvage yard located just west of Reading PA and usually have a number of Ford tractors in stock.

If your S-O-S is running then it might be less expensive and less of a headache to just sell or trade-in your current tractor and buy one that is already configured the way that you want.
 
I have a Industrial 4000 that had the transmission changed from a SOS to a five speed by the previous owner. Although I don't know the mechanics of it I know it works quite
well. It has a backhoe on it so there's no PTO involved. My other tractor is a 671 and I love my SOS tranny.
 
It's not a hard switch. To deal with the splined coupler just have a machine shop cut both of them in half and weld them together. Not expensive.
I think the pto shaft is the same but you will need the sliding coupler and the round plate with handle too.
And as said you will need the flywheel and clutch.
One thing not mentioned yet is the block plate.
01 Series tranny is 1/8" shorter than an 00 Series.
01 Series block plate is about 1/4" thick.
00 Series block plate is about 1/8" thick.
So you MUST have the block plate that came with the transmission.
Wrong block plate will cause problems getting the clutch to adjust properly.
I do not know if the plate thickness/tranny length affects the hydraulic manifold - or if it even does. Maybe someone here can tell you.
Nothing that is insurmountable but things to pay attention to.
 
Might email John Smith from his web site, he just performed this surgery on his mowing tractor. He would know for sure exactly what parts you will need.
 

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