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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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