Don't think all O-4 had the low speed low,there was a serial # break. If you have the O-4 low to put in a H you will need to use the lower shaft and all the gears,reverse idler gear and all gears on top shaft,they will work on the H main shaft. The O-4 main shaft will have a different ratio than a H one,also the rear mainshaft bearing cage is different between tractors. O-4 transmission gears in a H will make 3rd and 4th faster. also some O-4 had the faster than standard 4th gear and it would make a H over 7 MPH in 4th if used.Only way to keep a H standard 3rd and 4th speed would be to use parts from a low low for a H tractor or modify the standard H 3rd and 4th speed driving gear for use with the other gears on the O-4 counter shaft.
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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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