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Can anyone tell me where the vacuum reservoir is located on a 01 F150 4x4? I'm troubleshooting the 4wd not engaging want to check the reservoir. Any help would be appreciated
So I finally had an opportunity to get into the 4wd issue of not engaging again. I found the vacuum linkage (shaft with notch that moves the differential fork) and the differential fork separated. I pulled the vacuum arm out and reconnected them. The arm that engages the differential is a little sloppy and can move front to back causing the linkage to separate. I see a pin sticking out of both ends where the differential fork is mounted. Is there a way to tighten that arm? That pin is hollow. I thought it was an allen but it doesn't seem to be. Any suggestions??