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 - Restoration Story: 1951 Farmall H - by The Red (John Fritz). I have been a collector of Farmall tractors since 1990 when I first obtained part of the family farm in Eastern Indiana. My current collection includes a 1938 F20, 1945 H, 1946 H, and the recently purchased 1951 H. This article will focus on what I encountered and what I did to bring the 1951 NEAR DEATH Farmall H back to life.
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