its been doing it since i got the truck around 140,000 miles now it has 205,000 ive had my pumpkin resealed and the seal where the driveshaft meets rearend resealed as well not sure what it is just wondering if its sapposed to sound like that? sounds like coming from drivshaft/rearend but idk. like i said its been doing it since i got it. i got rear ended and it broke my pumpin seal so i had it resealed and where the drivshaft meets the rear end done as well. after i was hit both were leaking. still makes the noise but dont really notice it unless ur riding in the back or back window open and off throttle! any advice and anyone else sound like this?