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The 320 was the 40 continued on during the '20 series, and kept on as the 330 when that change occured. It was intended as an entry-level small tractor, but I figure it was also a way to unload a lot of older 40 series parts they had laying around as a result of the newer, fancier offerings. The 40/320/330 engines are easiest to tell apart by the lack of a water pump. The 420 had some minor alterations to the block, most notably to add a water pump needed to remove the greater amount of heat the enlarged engine produced. The 320/330 was a standard tractor, while the 420/430 utility were low ground clearance tractors. The way this was accomplished was to turn the final drive housings 90 degrees. The center line of the standard tractor rear wheels are in line vertically with the differential output shaft (the final drive housing drops downward). The center line of the utility tractor rear wheels are not in line vertically with the differential output shaft (the final drive housings move the rear wheels forward). In other words, the rear wheels are mounted further forward, and the tractor is lower, on the utility than on the standard. The other place to look is on the front end. Both are wide front ends made from steel pipe. The standard has a longer upright from the front axle to the wheel than the utility does. This goes along with the ground clearance changes to the rear wheels. Hopefully, I haven't totally confused you by now. These differences are obvious if you should get a standard and a utility next to each other. It can be hard to see, though, if you've only ever seen one type. The standard tractor needs more ground clearance for crops, but there is a loss in stability. the utility doesn't need the height, so it gains more stability for use with loaders, mowers and such. The 320/330 were only available as a standard tractor with only the 4-speed transmission and basic PTO with the single-cylinder lift unit. The 420/430 was available in several models (standard, tricycle, utility, crawler, row-crop-utility and several 'special' variations). They had a choice of 4-speed or 5-speed transmissions. You could have standard PTO, Live PTO and a direction reverser (shuttle shift) option. The hydraulics could be either single or dual cylinder rockshafts.
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