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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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