As long as you're dealing with a 3 cylinder chassis tractor... yes, you can make that change. As noted it will require the transmission and clutch/flywheel along with a rear axle change. Keep in mind that on 4000 S-O-S tractors the PTO is located in the transmission. In 8 speed tractors the PTO is located in the axle center housing... so you have none of the guts in the S-O-S center housing and they probably can't be fitted... So short answer... you need the entire back half and flywheel off a 4000 8 speed... or just find one with a bad engine and swap your engine. It's not as simple as it first sounds.
A 5000 would be a very easy swap because the PTO is in the axle on all models although the rear end ratio may still be different...
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Today's Featured Article - Memories of a Farmall C - by Monty Bradley. When I was a child, my grandparents lived on a farm owned by a Mr. Walters. The crops raised were cotton and soybeans, with about forty head of mixed breed cattle. Mr. Walters owned two tractors then. A Farmall 300 on gasoline and a Farmall C, that had once belonged to his father-in-law, and had been converted from gasoline to LP Gas. Many times, as a small boy, I would cross the fence behind the house my grandparents lived in and walk down the turn row to where granddaddy would be cultivati
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