Ok, I noticed when I am sitting still and i shift my Nitro into R D or P there is a wierd groan and the nitro wants to move a bit. I am holding the brake down when doing this obviously. It will happen in any gear I shift to, but if I have driven it for a while i don't have the groan but I can hear what sounds like a hum when i shift. Is the tranny electronically shifted? My date is 12/06 on the build. I hope its just because the everything isn't up to temp yet. Any info would greatly be appreciated.