Humming noise?
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At about 15 miles an hour it becomes noticeable. Then as I get faster and put more of a load on the gears, it gets louder. That sounds quite like me. Im at 55,000 Miles. 5,000 more and my warranty on that is up. So now is a good time for the gears to start killing themselves. I do have a little slack in the driveshaft. Or at least more than I had 25,000 miles ago.
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noise from the rear end when either accelerating or decelerating is USUALLY the pinion bearrings. this comes out from changing the loads on the pinion shaft during those times. accel noise is an outer and decel noise is the inner one. noise suring accel decel or coasting is a lil more complicated. can either be the carrier or axle bearrings as well as a possible problem with the gear mesh in the assembly.
none of these are normal. any bearring play shows a problem. as for the gears you need to open it up and check your gear mesh with marking compound as well as the backlash in the assembly to eliminate those problems.
I've also heard that a little play up and down or side to side on the drive shaft means bad pinion bearings. Back and forth play is normal.
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My type of play is a little more than a little. I know I can usually turn it a little bit. Maybe an 1/8 of an inch with it in drive and the parking brake on. But this is just about a quarter inch. Can this cause a serious problem in the future? Or is this just the calm before the storm? Im going to get it looked at reguardless, but im just wondering how fast I should probably jump on this. At least now I know where to look Pinion gear, or bearings. Since its still under warranty, I fear i'll take it o ford, and when they test drive it they'll say "I dont hear anything"