I think the IH Hydra Creeper was an over designed attempt to obtain low a speed. From an OEM point-of-view, perhaps it was cheaper than just using a large capacity direct coupled hydraulic motor.
Every motor has a displacement. For a given GPM input, a larger displacement motor will turn slower than a smaller one. Yep, the torque will increase but that can be controlled with a regulator. Too much torque might shred the tranny if the tractor ran into a "brick wall".
Goto the Charlynn site and look at the tables regarding displacement, speed, and torque. If you find something that might work, goto eBay and watch the hydraulic motor listings. I recently bought two motors that way to speed up a hydraulic driven sickle bar mower and another to power a 2nd countershaft in my W-9 for creeper service.
Or you could get a Farmall H and couple the motor to the belt pulley gear box. No need to mess with the throw-out bearing. The main clutch and tranny could still control the tractor. No need for a hydraulic valve; only two hoses and a properly sized motor. You disengage the creeper system by shifting the BP gearbox out of gear.
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