Sort of a dumb question but...I've got the stock automatic hubs...never had a problem with them. I decided I'd get some warn manual hubs when my auto stock hubs went out. How can you tell when your hubs go out? I mean if both go at the same time...I'm sure you could feel it...but explain it. If I went outside and wanted to check...could I just crawl underneath and turn the front driveshaft or what? If the transfer case is not egaged in 4x4 should I be able to freely rotate my front drive shaft?