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Matt, If you plan on using a tractor for your farming operation today....there is no question which tractor series is more productive. The 3010/3020 will run circles around the 720. It has much better hydraulics, better power steering, more gear speed options, better handling, and most of all a foot clutch. Now, I'm not saying that the 720 is not a good tractor. I've a 720 gasoline tractor that I absolutely love. And to tell you the truth, it will pull our 3010 Diesel around the block. But, for the day-in-day-out convienence and less maintainence I would go with the 3010 or 3020. We have a 1963 3010. It has a reman later model 3020 motor so it is a bit more peppy than the stock 3010. I would definately go with the diesel version as they are much more powerful and pain free. I would guess your 720 could be worth anywhere from $2000 to $3500 depending upon overall condition. A good 3010 will cost slightly less than the 3020 because of it being made less years and not as big of popularity. I know that the 3010's were not available with the differential lock that your 4020 probably has. Either model 3010 or 3020 should perform wonderful. If you just love that diesel two-cylinder sound then keep your 720. Even with your electric start conversion and 3point it will still be cheaper than a good 3020. You could easily spend $6500 on a 3010/3020 diesel in good shape. If you can find one with rough tires and rims you could swap them from your 720. Good luck in your decision. Either way, both are good machines that will work for years and years provided that proper maintainence has been followed. Tyler-MO
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