my fan hub bearing is making noise and im gonna change it but having trouble finding a bearing. got the part number from cumminsp/n 3910739number off bearing BD35-12DU8Athey want 250 bucks for it. which is ridiculous. cant find it anywhere else though. any ideas? thanks

Take a bunch of measurements and try to find one the same dimensions. Here is one site that might help. http://www1.mscdirect.com/eCommerce/NavigationServlet/Motion-Control-Fluid-Power/Bearings/Radial-Ball-Bearings/_/N-77fnx?cm_mmc=Didit-_-SEM-_-ItmDtl-_-PypClk&002=2167139&004=2261999464&005=2661047768&006=8086824904&007=Search

problem with that is i dont have it off and cant just pull it off cuz i need to drive the truck and dont have my tools at school here with me

All bearings have a "timkin" number on them. The combination of numbers/ letters are used for that bearing only no matter who make it. If you can find that number on the bearing you could get it from a supplier. NOTE: some auto and truck bearings are manufacture specific and can not be found on the open market. I tried to rebuild a Volvo transfer case the other day. I went to my supplier for new bearings and races, no go, they were dealer idem only.