If I reverse out of a stall, then put it into drive and go, I usually get a loud clunk noise from the rear of the Xterra. Now if I reverse out, put into drive and wait 3-5seconds before pressing gas to go, I will never get a clunk noise.. It feels as if the gears in the rear gets stuck out of place, then pops back..

Anyone with ideas on what it could be??

Thanks,
Eric