4630s were still a "small" frame - roughly the same dimensions as a 4430. Also only came with small 1000 PTO. Had the 404 with intercooler. Early models had the same seat as a 4020 - were great on an open station but poor in a cab. It would have to be a 1977 model and extremely cheap to entice me to buy one over a 40 series - super nice and under $9k. 1977 model is even more important if you go for a quad range. The shifter linkages were made much better that last year. Not as important for a powershift
4640 and 4840 were large frame tractors - wider and longer. They have a more comfortable ride, but they're also not as manueverable. They came with big 1000 PTO only. There is a serial number break at (only going from memory, so i may be a lil' off) 10,250 on the 4840 and 16,500 on the 4640 powershifts where they fixed a problem with the PTO. Many have been upgraded, but you need to look over the PTO if below those numbers. The PTO should not slide in and out at all. If it does (even a 1/16th), it has not been upgraded. they also had the better 466 engine.
I have both a 4640 I bought to replace a 4430 and a 4840. They're great tractors. Used to hurt their value that they did not offer 540 PTO, but so much stuff is 1000 now that it isn't the case as much anymore.
Keep in mind, these were the brutes of their day - biggest row crop tractors available. Lots of them had their guts pulled out. Have them dynoed and if they're running over 200 hp, turn them back.
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