Sherman's

[Zackary W]

So I have a Ford 640, will a sherman combo shift or hupp shift fit on the tractor, I know theres different spline count so how many splines does mine have, and is there hi, low, direct range on the sherman hupps.

 

[Sean in PA]

So I have a Ford 640, will a sherman combo shift or hupp shift fit on the tractor, I know theres different spline count so how many splines does mine have

I am not sure about the Hupp, but the Sherman combo auxiliary transmissions will work on any 4 speed Ford tractor transmission made before 1975. There were differences in them for some years/models/series of tractors, one of them being the spline count on the input shaft as you have mentioned, so you need to get one that is for your model of tractor. Your 640 would have originally had a 10 spline input shaft.They changed to a 15 spline input shaft partway through the '01 series production run.

and is there hi, low, direct range on the sherman hupps

Not sure what you mean by "the sherman hupps". Sherman was one brand and Hupps was another. Sherman made different types of auxiliary transmissions. One was a step-up only that gave you a high range as well as the factory direct range. There was a step-down only Sherman that gave you a low range plus direct. There was also a Sherman reverser auxiliary transmission that simply gave you normal or reverse rotation on the input shaft so you either had 4 forward and 1 reverse gear or 4 reverse and 1 forward. Then there was the Sherman combo, which is what you specifically asked about in the first part of your question, which gave you high, low and direct.

The only Hupps that I am aware of was similar to the Sherman Combo in that it had high, low and direct ranges as well.

What are you looking to use the Sherman Combo or Hupps trans for? Since they alter the speed of the input shaft of the main transmission, they also alter the speed of the PTO, so using the low range does not help to slow down the tractor when you are using a PTO driven implement, as the implement won't be driven at the proper 540 rpm speed unless you increase the throttle to the point where the ground speed is the same speed as if you have the aux trans in the direct ratio.

 

[Kirk-NJ]

Sherman combo and hupp dual drive. 10 spline input shaft

 

[UseFixUse]

I have always hoped there was a way to pull a garden tiller behind my 641 but the explanation from Sean in PA suggests it is not in my future, even with a Sherman transmission graft. Thoughts?