Bad shock or spring
Road debris damage
Abuse
Fatigue mostly or rust.
Low air pressure in one or both rear tires, a sway bar or sway bar link is broken.
It has a sway bar in the front and in the rear. It has a connecting link at each end of each sway bar = 4 total
How do you install a rear sway bar on a 2003 f 150 4 wheel drive
Not hard at all. 6 bolts for the sway bar, and depending on how many links 8 bolts if it is a 4 link, figure 2 bolts per link. ues jack stands to hold the rear axel in place and do it one link at a time. The sway bar cones off in one piece so do that last.
The defective sway bar link can cause the clunking or the rattling of the noise from the front suspension during the low speed driving.
there should be a rear sway bar
Check the sway bar link kits (common to break) and bushings. Also check the rear struts for wear and/or leakage.
More than likely the sway bar links - TSB on these
Just had that problem on the rear of a Lexus ES300 and it turned out that both rear sway bar frame bushings were worn out. After replacement the car sounds quiet.
Common problem with these 2000-04 fords, there is a sway bar link (approximately 12" long) which attaches the front strut to the sway bar mounted on the cars underside. The link ends wear and cause a "sloppy" connection between the two points. This is then herd while driving and hitting potholes as a "clunk". Just replace the sway bar link and everything will be fine!
sway bar end linksway bar end link