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2000 ford F-150 4X4. I'm driving 65 MPH on highway, very fine hum/vibration feels like its drive shaft or rear end. Also, When I let off gas, it vibrates from rear.
Anybody know if its U-joint or something else? Thank you
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you didn't give alot of information, but there are some things that you can check. first, when was the last time you rotated your tires, if its been awhile then try that.(cheapest). second are your tires out of balance, check to see if any of the weights on the rims are missing. if the tires are in good shape have them balanced. (not alot $). third, with the truck flat and level and securly raised and blocked, try to twist the u joint halves back and forth,in and out. if the cross moves at all in the u joint cups then the joint is bad.(not the shaft moving). fourth with the truck still up in the air, spin one wheel by hand (engine off, trans in park) listen to the differential, listen for poping and snaping or un even sounds. lastly you can check the drive line by having some one in the cab start the truck and keep the brakes hard on. next go from foward to reverse a few seconds in each and try to pin point any irregular noise. don't go under the truck just look and listen then shut her down and try to find the noise by hand.
good luck.
This seems to be a common problem in later model F150s. I personally have the same problem on my 2003. (Ironically, that is how I found this site) Did this just start happening or has it been happening for a while? If it has normally been doing this, then it may be just one of the quirks of your truck. If anyone out there has any suggestions to resolving this issue I am also interested to hear about them! I have though about trying several solutions such as lubircating the drive shaft, regreasing the rear end, ect. But I have not found any really solid answers to this.
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