Ford Excursion uncertain 4 wheel drive functionality, possibly due to leaking hose or hubs on Ford Excursion

Some Ford Excursion owners report experiencing issues with the 4-wheel drive functionality due to leaking vacuum hoses and corroded hubs. These problems can lead to partial or complete failure of the 4WD system, as leaking hoses may prevent the hubs from activating properly. Additionally, corroded hubs can hinder the engagement of the 4WD system, impacting the transfer of torque to the wheel hubs. Some owners notice that if the front driveshaft spins while the transfer case is in 4WD but the front axle shafts do not, it may indicate an issue with the hubs or the vacuum system. To restore proper function, it is recommended to replace rotted hoses and upgrade corroded connectors with brass fittings. Addressing these concerns is essential for maintaining optimal performance of the 4WD system in the Ford Excursion.