i have a 87 f-150 6cyl with an automatic transmission and its 2wd. This noise has been around for a while but now its drivin me nuts. It is a weird noise, hard to describe, i guess it is your normal squeaking noise but it usually happen when i accelerate. It never happens when im on the brakes, sometimes it makes the noise when i am just idleing forward and sometimes it doesnt. And it is really bad in the rain. And if i run it hard, like 80mph+ for like 30 seconds, the squeaking will go away for the rest of that day usually but be back again the next day. Any suggestions on what it might be?

 

no ideas huh?

 

Check u joints and rear end bearings first, do you have a 2 piece drive shaft? carrier bearing could be bad