Dsl: I suspect those 18.4x28 tires are the reason for the increase in speed, they'll make a big difference over the 14.9x28. You've actually gone up 3 sizes. Over the years I've increased Farmalls 560 and 656 from 15.5x38 to 16.9x38, Farmalls 130 and 140 from 11.2x24 to 12.4x24 and I had a 1066 ordered in with 20,8x38 rather tha the standard 18.4x38. Each and everyone of those changes made a substancial difference in road speed, and in all cases it was only a one size step up.
I don't think there were any optional gear sets that would change all gears. Over the years IH had options for various tractors that would change some of the first 4 gears, but never 5th. Since 5th is straight through 1 to 1 in transmission, it would have to be crown and pinion or bull gear and brake pinion gear and shaft change. Don't think there anything along those lines that would increase speed.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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