Here's my stats up front. 2006 LJ Rubicon. 4" lift with new Currie LCAs, factory UCAs. 33" MTZs, new shocks, Rock Krawler adj. front trac bar w/drop bracket, drop pitman arm, Rock Krawler discos. Recently aligned and tires balanced, everything torqued to spec.
Here's the problems:
Had a front end vibe, that I assumed was drive shaft, so I pulled it and took it to a reputable shop in the area, and they checked it and the front u-joint near the pinion was bad, so they replaced it. They checked the rest of the drive shaft, cv joint, and checked the balance and said it was all good.
I put the shaft back in, and am still getting a vibe from around 45 mph and up. It's not as bad, but still there. Pinion angle for the front shaft is spot on (directly in line with the driveshaft, checked with angle finder multiple times). Had a t-case drop I took out, put it back in. With the t-case drop in or out, and after checking pinion angles, I still get vibes.
If I pull the driveshaft, I don't notice the vibes anymore. If the shaft is in and I put it in 4wd, the vibration is gone. Back in 2wd, vibe is there. All the U-joints in the front driveshaft are greased, and so is the CV joint.
The initial notice of the vibration lead me to believe that it was the front driveshaft, but after having it checked, I'm not sure of that.
Is there something else in the front end that could be causing this "pulsing" vibration in the front end that is just being transmitted through the driveshaft when it's connected? I'm out of ideas, and the shop is closed for the holidays.
Not being able to figure this thing out makes me want to drive it off a bridge