If considering a 4WD second hand tractor, inspect the front-wheel-assist drop box, universal joints, and front differential seals. Engage the four-wheel drive system on loose soil to confirm smooth power delivery to the front wheels. Leaking hub seals and clunking sounds under turning loads point to worn planetary gears that require expensive repairs. https://md.darmstadt.ccc.de/s/Y6C0Hd5893