RJfromGA Hupp

If you desire to know which version of the Hupp you have you can pull the nose cone off and look inside. Look past
the rear gear at the back of the case. If you can see the allen headed bolts that hold it in place to the tractor,
you have the high range Hupp combo transmission. If you have to rotate the gear to see the bolt heads in the
notches cut into the gear, you have the low speed version of the Hupp combo. If your Hupp binds up shifting between
the different ranges, you have the early version. If the center stationary gear just under the nose cone has two
ears in the center of it, you have the weaker early version. The center shaft will also have only two matching
grooves milled into it. The newer version has 5 grooves milled into it and the center gear for a matching strength
of the Sherman. The Sherman only came with the 25 MPH top speed range and not the lower gear ratio of 15 MPH such
as some of the Hupps.
So, best way to find out is to drive it wide open. if it bounces just under 15 MPH you have the low range. if you
can get it up to a shade over 20, you got the high range. My high range has a welded case and is sitting submerged
in a 5 gallon bucket of oil out there somewhere. Those dual ear center gears can be spendy to replace. The updated
pieces including the shift arms to eliminate the hanging between gears are long out of production. So, if you
really like your Hupp, keep your eyes open and figure they are worth about $500-750 versus the Sherman typically
running $750 - 1200. The last Howard trans that sold on flea bay went for just a shade over 1500.

Thank you so much Bruce (OR) for such a great explanation. Been awhile since we had it apart but from your description, if memory serves me right, I believe it is the later high range version. I'm pretty sure it had the allen head bolts, and I don't think the gears had to be rotated in order to install them. I know it was kinda trickey and tedious to get them in, but I don't think we had to rotate the gears. I do remember that in high range in fourth gear, it would go pretty fast. Next time we get it out will give her another spin to see. Once again thanks for spending your time to explain it to me. Was a great help.

Sorry, didn't think to take pics of inside. Would these help any?

Sorry, still getting used to adding pics

Now if you had a pic of the input shaft inside the trans that might show the funky stationary gear with either 2 or 5 inner teeth. What you have there in pics doesn't show it. Wanna check that speed? get the wife to chase you in the car or get a GPS. GPS has better accuracy. The high range should top out at 24.75 MPH. Tweak the throttle linkage and you might break 25. Just fast enough to put that orange triangle away.

Thanks Bruce. One more question. If in fact it is the high range Hupp, would that mean that the underdrive gear would also have a higher ratio than the low range Hupp? Thanks in advance.

Yep. It does. The speed difference currently escapes me as to where I put the chart. My current problem being that after the Hupp, I run it through a Howard and have plans to add an Everett. So the wife will be entertained with 48 forward gears and 12 reverse. Unfortunately I just had my left knee start going bone on bone and will be screwed up with that for some long time to come. I have yet to get into ortho and that is at least another 6 weeks out. So for now I just don't try to bend the knee. Sitting at a desk. yeah. such fun. Now to get a supply of yellow rubber ducks
before the next doctor's visit. Think that will impress them??

I think maybe the wife might have knee problems after running thru all those gears. But the thought of all those gears is kinda cool. Sorry about your problem, good luck with it, and yep, that should impress them.