Originally Posted by leftlanetruckin
ok, i saw your other thread.
1) your driveshaft slip yoke is getting borderline IMHO. there is not much engagement on the splines so it seems from the pics.
2) the differential yoke should be the same angle as the transfer case output on a u joint shaft. so if the transfer case shaft is level to the ground, that is where the differentials pinion gear needs to be. the same angle counter acts the vibes you are getting.
you need to either address the slip yoke correctly (sye/cv shaft), or get a shim in there.
i have never used shims so cant comment on the angle you need, sorry. i have always rewelded perches etc to get angles 110% correct.
Well, I went outside and looked everything over again. I decided to take the Jeep back on the road for another test drive. I rolled the windows up, tightened the soft top as much as it would go, and killed anything that would make noise: like the radio, blower fan, even my cell phone in case it went off. I drove it down the road about two miles, intentionally revving to around 2,500-3,000 RPM's between gears. I still heard a slight vibration from the rear area, but not nearly as significant as what I heard yesterday. I then rolled my windows down and I could barely heard it at all... maybe the lift settled in over the 24 hours it was sitting in my driveway
So I pulled back in the driveway and got my torque wrench out. I went around the entire suspension and tightened all the fasteners to factory specs, again, just like I did a day prior. I tightened everything again, even the steering stabilizer I put on about 3 months back. However, nothing seemed loose. Once I was finished, I took the Jeep out for another test run... now the vibration was gone
I couldn't hear it at all. I even swung back by the house and had a friend drive it the same 2 mile route with me in the backseat listening for anything. It was gone! I then took it on a new stretch of highway that was just built and drove the Jeep up to 70mph. No problems at all, and most importantly, no vibration what so ever. All I could hear was the transmission winding and tires humming.
The only thing I can think of is maybe something was loose somewhere in the mix; and re-torquing the entire set-up must have fixed whatever wasn't tight enough. This is good news, but I will still try to call ARB/OME, and maybe Quadratec, again tomorrow and talk with a tech. I'm also due for a tire rotation and now my alignment is a little off from all the suspension work; so I'm also planning on going by my former Jeep dealership (thanks Chrysler) and having that done since I have a coupon. I'm going to talk with one of their Jeep mechanics about the rear drive shaft angle as well.
Thanks for the help guys,