Thread: 03 F250 4x4 not
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Old 12-16-2007, 11:31 AM   #2
ldunning
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Join Date: Apr 2006
Location: Glendale
Posts: 42
M.O.C. #5692
When I had a problem with the front hubs not locking in it was a seal in the hub that was bleeding off the vacuum and thus there was not enough vacuum to engage the hubs. I was able to lock the front hubs manually. You can check vacuum at the hubs by disconnecting the vacuum line at the hubs. There is a vacuum pump and I believe a relay under the hood mounted on the right inner fender. Good Luck
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