I'm not as knowledgeable on JD industrial tractors since I was employed at a AG dealership. A 400 has a 4 cyl engine while a 300 has a 3 cyl. so the 400 is going to be longer between the mounting holes on the frame than the 300.
On the no working reverser on the 300 either the shifter valve or the reverser clutch pack has failed. If it's the clutch pack a split is required of the tractor.
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Today's Featured Article - Tuning Up Your Tractor: The Battery - by Curtis Von Fange. Buried somewhere beneath the sheetmetal, under the gas tank, or stuffed in front of the radiator is the battery. This elusive and neglected component of the tractor is the hardest to get to when it is dead and in need of a jump. But usually, the storage battery is a storehouse of electrical energy waiting to be released a the flick of a switch. A few maintenance tips and periodic cleaning will keep it charged for the duration of its life span. The battery is made up of a number of lead bas
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