Interesting, a I-6 tractor used 23 teeth, never heard of 28. Must be parts from some specialized equipment IH sold or aftermarket gears. If there's 28 teeth were 4th and 5th sliding gear locks on I suppose theres 28 teeth that drives the constant mesh gear. If so the tractor must be plenty fast unless it has a special ring and pinion to slow it down. You may have to replace the transmission input shaft with standard M parts along with a constant mesh gear if needed, unless parts are found. Does the 4th and 5th sliding gear have a IH part # on it.
Thought of something else, does this tractor have a shift mechanism going in the left side of transmission housing? Does the gear have a # starting with a letter H and another letter? I'm not that familiar with heisler 9 speed aftermarket transmissions, but I'm thinking at one time they made one with the highest speed range gear on the rear of the input shaft and the 4th and 5th sliding gear locked on it for 5th. Could be what you have and if so it was made by heisler corp. Long out of buisness.
This post was edited by D Slater at 19:28:57 05/15/10 2 times.
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