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I got a 2002 ford f150 FX4 and i got a rumbling feeling from my rear end. It only happens when i take off from a stop. I also noticed that my 4wheel high does not work but my 4wheel low works great. What could this be. Need some help.
My rear end had a rumble/vibration in it when starting off, primarily accelerating while turning. I changed the gear oil to royal purple and the problem persisted. I then added the ford LSD friction modifier and havent felt or heard it since. (its been a couple of months) As far as the 4wd there is a good chance that its a separate issue. Are you sure it is locking into 4Low. Just because your in 4Low doesn't necessarily mean you have power to the front wheels I believe. I am sure I will be corrected if this is not the case. Good Luck man.
A word to the wise ain't necessary - it's the stupid ones that need the advice.
I dont know. The thing is i have changed my differential fluid 2 times and I have absolutely no metal shaving. But the other thing is it only happens after i drive it for nore than a half hour or so. It doesnt do it when it is cold.
Well, when i put it 4x4 high the 4x4 light does not come on. But when i put it into 4x4 low the light does come on. Ok know when i put the transfer case into neutral, I can leave it in few a few seconds and when i go to take it out it make all kinds of grinding and slamming. I have checkes when it is in 4x4 low it is engaging all the way.
Well my truck was doing this so while I was at the dealer for a transmission flush, they replace my rear axle "clutch" since it would shutter when I would be making a turn at low speed and since it's still under warranty, just had to pay my deductible plus hanging around the dealership all day but no more shuttering, yeah!!