I've done a lot of searching and so far haven't fount an answer to this but when i have the 1356 in 2H it vibrates like crazy but it goes away when put into 4H. this didn't start till i first tried to put it into 4H a couple of months ago. I've only had it since sept/oct and don't know much about the history other than the previous owner didn't know how to properly maintain things. i just replaced the transfer case motor and shocks all around and the vibration went from 35-45 down to 30-40 and then constant around 60 on up but only while in 2H. if there is a thread i missed some where that explains it please let me know as this is driving me nuts for the past 2 months and i hate driving it in 4H full time.:cry:banghead