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 - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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