When I am in 4wd, when I shift from 1st to park I get violent grinding sounds from underneath my truck. In 2wd it works as normal. It is especially bad in 4Lo. What could be causing this? Am I shifting the truck right? Do I have to be in neutral to shift the T-case, or can I be in either park or neutral? Still, I don't know why it would grind when I am just shifting into park... I figured I'd have to rebuild my tranny at some point this year, but I hoped that I'd make it to Xmas. If my tranny is dying, there go my new gears and locker. I just got my lift, too. Pics to follow... Anyway, I'd love to hear some speculation as to what the deal is with these noises. I am amazed that I can hear such a violent grinding and then have it work just fine.