I am new to this site, just bought an '06 Frontier about three weeks ago. Yesterday I took the truck into the local dealership to fix some problems. The most intriging problem is a strange noise. It is a groan/growl coming from what sounds like the drivers side about the time it shifts from first to second gear (automatic trans). The sound only emits at the first shift after startup. Once started, it is quite after that first shift. Turn the igition off, restart and it does it again, one time.

Anyone had this happen?