I grew up with an 80 and a 730 on the farm. (They're still on the farm.) Some time about 1985 my dad put new radial tires on the 80. (They're still on the 80.) It was the main plowing tractor (still is the main plowing tractor) pulling a 5-16" hydraulic reset plow he'd bought new about 1970 to go with the 80. We were plowing a low area in a field which he recently had tiled, and it was solid with an old stand of cattails, dried from the tile. When that 80 came to those cattails with those new radial tires, the front end of the tractor came right off the ground! I couldn't keep it down! It kept jumping up and leaving the furrow! The old girl barked, blew black smoke, pulled its front off the ground--but she kept that plow going forward! I held on and struggled to keep it in line with the brakes, which I did fairly well. That was pretty exciting to a 15 year old kid. I'll never forget it.
Not long after that I was plowing an old dry stand of alfalfa with that tractor at night. I pulled into the furrow and lowered the plow, and within 50 yards, fire stood up off the stack a good eight inches! And it stayed there for the length of the field, getting shorter or taller depending on how tough that alfalfa was, pulsing with those big cylinders. The muffler glowed a dull red! I watched my gauges and kept her going. The front end bounced and jumped, fire stood off the stack, and I thought I was in farmer heaven. I don't know how a tractor can take that, but it did. Water never got over 175. Great tractor.
My dad has overhauled that 80 twice over the years that I remember. Last month I plowed a 28 acre field with that tractor and plow and then seeded it to alfalfa with it. Great machine. I always feel like patting it and saying thank you when I park it in the barn.