so my truck rear suspension is squeaking big time. every time get on or off the bed it would squeak. goin on rough road with my window downi i can hear it also. i asked the tire folks when i was getting new tires and they say it was the leaf springs. i also ask my friend whos a grease monkey and he says he think its the shocks. so whats the remedy for this guys? i also read a post somewhere here and someone say dont spray it with wd40. are these stuff covered under any warranty? i didnt bought those extra warranty, just what came with when i bought the truck.