Leroy neither of those Farmall "H" tractors have been on this farm since 1975. They where in good running condition. That hill you all are saying is nothing will whip a 450 horse power semi going out with a load of grain. That small hill is a 8% slope. It is steeper than it looks. Plus the Farmall "H" we had where both older one that did not have Super H parts in them. They both where bought new and where rated at 21 belt horse power on the original invoices.
The only trouble with those Farmall "H" tractors was that they where under powered for there size and had a real fast road gear.
Also guys trying to make me defend a JD two cylinder is a lost cause. They where a crude tractor that just about put JD out of business. I personally collect the 10 series and newer. I am not a fan of hand clutches or hand brakes. So I only have a few of the older JDs that the family had.
Plus the original poster has a clutch problem that is unrelated to how much horse power his tractor has. He can't get the power to the wheels.