Let me preface this by saying that my knowledge is limited...sorry if this is long, but want to give a thorough history.

A few weeks ago my '01 Quad Cab had a high pitch squeel and vibration when accelerating and decelerating I took it in. Replaced wheel bearing and said my front driveshaft cv joint was shot. Picked it up then next morning on the interstate had a very bad vibration...it felt like I went over the strips on the side of the road, but didn't. So I took it back in, the said the joint was shot again and repaired for free thinking they did something wrong. Picked it up, on my way home on iterstate, same vibration, but this time after the vibration, I could not accelerate...just a high pitch wheez like I stripped the splines...which is exactly what happened. So...

Shop speculated that perhaps it was erroneously trying to engage in 4HI as I was driving, hence the vibration. Instrument panel switch is not an option since it has to process through computer, but transfer case electronic motor failure defaults to 4HI, so replaced that. After that it was driven for short distances and monitored the joint temperature. After only a few miles, at around 45mph, the joint was around 260 degrees! So...

Shop is not sure what is causing this cv joint to overheat and fail. It's been nearly 3 weeks and I'm tired of not having my truck. Hoping someone on here knows what would cause this front driveshaft cv joint to keep burning up.