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I have a 2000 F250 SD Crew v10 with 85,000 miles. When I drive at speeds around 40-50 mph there is a heavt vibration coming from under the floor boards. It seems to happen more when I am doing a lot of city driving, rather than short trips to work where the truck is parked all day.
Originally I thought it was my Auto Hubs trying to engage on their own. So, I changed to Warn premium manual hubs. Currently, the hubs are unlocked. When the vibration starts it does not stop when I hit the brakes. BUT, it immediately stops if I switch the ESOF to 4wHigh!
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