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Stock JK TechBulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer.
Older vehicles had locking hubs that disconnected the wheels from the axles. My dad always could tell the mileage difference in his F150 with the hubs locked and unlocked. I wish I still had the option...... but then again it was a PITA to go lock em in all the time