Depends a lot on condition and if it is early, mid or late series, was changes along the way. If you got the serial number I can tell you exactly what it is. Being powershift, probably has diff lock but not all did, that can be a PITA without at times, trust me, I know first hand lol. Was other differences between early and later, the really late ones were best of all, dry air cleaner, 12 volt, side console and more. Powershift is nice, sure wish I had it in mine for like on the square baler and more.
Guessing it is a standard with 30 inch rubber, was something I always hated about mine that the drawbar literally drug on the ground, changed it over to 34 inch hubs and tires I got from Alberta Pioneer's 4010 with some horse trading, OMG, its like a different tractor and now so much more versatile for different jobs since the drawbar is over four inches higher than it was, exactly the same as the 4020 now.
Also depends on what loader is. Make dam sure to inspect carefully the two mounting lugs where the engine bolts to the frame rails front and back both sides...3020s were notorious for those breaking out of the block if someone got too rambunctious and rammy with the loader, as they were only two bolts each, rather than the four bolt ones the larger 20 series had.
Contracts are made to be broken, a handshake is the law of God.