Hey everyone, long time troller here. This forum has provided a wealth of knowledge just not on this one. I'm stumped. I have a 2005 I5 crew xtreme. The truck just turned 100,000 on the clock and I'm starting to get a suddle vibration around the 2000 rpm range shifting from 1st to 2nd. I read possibly the selonoid, the weird thing is that it doesn't do it when cold only when it warms up and not all the time. Any ideas on this one? I checked the shaft and didn't notice anything in particular.