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The 3pt would be handier, the pull behind is sometimes a better disk. Will you need to move from location to location when disking? Then you want a 3pt. If you have one field area, and won't travel on roads, then a drag type is great. If you work in mud, the drag type can sink you tho, no backing out of a wet spot! I will assume it is a tandem disk, 2 pairs of gangs? Look that the blades are not loose on the shaft. This makes a lot of wear, and becomes difficult to tighten up again. This would be the #1 thing to look for. Look for wear of course, on all the pivot points, hitch, angle ajuster. Make sure the disk blades are big, not worn down. You can spend over $10 a blade to replace them, get a disk that has good big blades. The bearings - older ones are wood, and usually 1/2 shot or more. If the metal is not worn away, you can make your own bearings pretty easy. If it's all steel, then make sure they are good, as replacements are sparse or very spendy. If it has newer taper or roller bearings, figure in the price of replacing any, can be $20 a piece, can be $110 each. I'd want to know what make it is, so I can track down the types of parts I'm looking at. But some are just Old Rust brand, so it is. :) 8' drag should work well with a 550, some days you wish it was wider, some days it will give your tractor all it wants - depends on the season & type of soil you are in. --->Paul
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