I'm driving a 1/2 ton 3100 with the original setup, 216 with the 3 on the tree, 16 inch tires. I don't drive farther than 20 - 25 miles from home, since the block is a little cracked, but I drive around 50 mph, and I think it is actually going some faster, since not so many pass me by. It runs just fine, feels strong, even on those few occasions when I load it heavy. It seems like a good strong unit.
