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 - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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