I am experiencing some noise that seems to be coming from my back end while driving. It sounded like brakes, and the brakes were already worn down, so I replaced them. I still have the noises even after the new brake pads. I am thinking possible suspension, or it could be the brake rotors, as ford said they needed to be replaced when they put the pads on. I just figured they were trying to make a buck, as I didnt think they were in that bad of shape. Anyone have any idea what this high pitched hoise could be?
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1999 F150 XLT super cab OFFROAD package 4x4
5.4 L Triton V8, automatic

Mods:
AutoPage RS-750lcd alarm/remote start
Dual stage proximity sensor
Ford Racing Euro tails
Xenon headlights
Spray on underbody coat
20% window tint on front 2 windows
Audio:
Eclipse 5x7 point source coaxials 85741
Eclipse 8052 head unit
Eclipse 2-channel amp 3122
Eclipse 4-channel amp 36401
MTX Thunderform sub box
Image Dynamics IDQ8’s

Future modifications:
Flowmaster 40 series delta flows w/ duel tips out the rear

 

Hey Scubasteve

I am not sure without hearing your sound for myself, but it sounds like the same thing that happened to me. I had a sound coming from the rear when i accelerated and braked and it turned out to be my driveshaft. It seems that there is an inner lining inside the driveshafts and it sometime will come loose inside causing the driveshaft to get tweeked i little bit upon acceleration and braking so you might see a drivetrain mechanic and see what he thinks. Hope i could help cause those sounds do get annoying.


4x4Troyer

 

Same thing with my 2001 4x4 sounds like the brakes rotors or something cant seem to place it. It happens every time i get off the gas it make a funny noise.

 

I think there is a TSB on this. The leaf spring bushings move because they were not installed properly at the factory and the end of the spring rubs the shackle (Metal to metal) and it can make a screaching sound like brakes can.

check it out!

 

nope just found out that it is the drive shaft, there is a plastic insert that breaks inside and thats were the noise is comming from