That MF135 diesel has a basic gear drive tranny 6F/2R with multipower-a hydraulic setup that gives you two more ranges for a total of 12F/4R.
Roundish gear boxes? Are you referring to the bull gears that are used on the rear axles of some high crop tractors--like the 1951 Minneapolis Moline BF tractor that I'm restoring now?
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If so, the answer is no--my 135 is a standard field tractor without bull gears like a high crop. No modifications were made to the rear axle. The original owner replaced the 28" dia rims that you generally find on the rears of field tractors with 16" dia rims carrying Goodrich 6-ply 18.4-16A rubber. He used shortened spindles on the front axle to keep the tractor level. He used it mainly for mowing and discing his olive orchard, essentially converting a field tractor into a low-squat, high-floatation orchard tractor. BTW--this is a simple way to modify a field tractor for mowing steep slopes. The 18" wide rears are used on a variety of big ag equipment (swathers, combines, etc) and are readily available at places that sell ag tires, like Les Schwab out here on the West Coast.
Interesting points about gaining more stability for work on sloping ground. Thanks.