Is a 01 Jeep Wrangler front drive shaft always spinning?
No, a 01 Jeep Wrangler's front driveshaft is not always spinning. It only spins when the front axle is engaged, either manually (with a shift lever for part-time 4WD) or automatically (in some systems with automatic transfer cases). When driving in 2WD (rear-wheel drive), the front driveshaft is not spinning.