If this is a farmall 560 the slower third uses a 32 tooth gear driving a 41 tooth in the transmission. Faster 3rd is a 34 tooth driving a 39. Slow 4th is a 38 tooth driving a 35. Fast 4th is a 40 tooth driving a 33. Would have to figure it up to tell you the speed difference. Played around with those gears in a 400 which turns a lower RPM than a 560 and have some figures wrote down. With a 400 ring and pinion, dirrect T/A, 14.9 tires.at 1450 RPM the slow 3rd goes 4.97 MPH, with faster 3rd 5.56 MPH. slow 4th 6.91 MPH, fast 4th 7.71 MPH. Same as above with a 560 ring and pinion, slow 3rd 4 MPH, fast 4.5, slow fourth 5.57, fast 6.2. Faster first and reverse and slower or heavy tillage 3rd or 4th gears in a 560 are the same gear ratio as the standard ones in SMTA, 400 and 450. May have some numbers confused while typing, if anything looks wrong give a shout.
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