Just got to work, drove about 50' in a straight line into the parking spot. Left rear is about 1.5" lower than the right again.

 

Any chance that you're parking on an uneven surface? Just because it's pavement, doesn't mean it's flat....

I'd also suggest taking a look at your shocks. I've seen shocks that "stick" compressed before. A good gas charged shock will always try to extend itself. You'll need to unbolt the shocks to check them, unless you see that you have leaking shocks.

 

It's a perfectly level surface, on an airport. I park in the same spot everyday, it will lean some days, but not others. Even if I back into the spot it will lean to the left still.

I just replaced all of the shocks with Belltechs. It leaned with the stock shocks also.

 

I have a poor opinion of BellTech shocks. I'd recheck them even if they were recently replaced.

Another thing to check for is binding bushings in your leaf springs, and control arms. Those bushings should be torqued with the vehicle's weight on them, as static height. Sometimes guys torque them with the vehicle on the hoist.

Just trying to throw some ideas out there for you.

 

Also, don't rule out the front end being the issue. Like AKlowriderZ71 said, check the control arms, and front end components. It could be completely the front of the truck throwing it out. I doubt it, but you never know!

-Kenny

 

The front sits pretty much level.

I glanced under the rear today, didn't any anything wrong with the bushings. Nothing was onviously loose. My pinion angle looks awful though. I took some picture. With the axle rotated this far, there is more compression on the passenger side shock than the driver side. Perhaps this has something to do with it?

The angle of the driveshaft was about 2*, and the diff housing (measured underneath the nose of the housing) was about -12*.

 

Wow, that's pretty ugly! I'm surprised you aren't getting any vibrations from that.

If nothing else, it's a good place to start. Needs to be corrected anyways, right? As far as those bushings I mentioned, if they all look okay(nothing appears to be coming apart), then park it on level ground & loosen all 6 leaf spring bolts, and all 8 control arm bushings. Jounce the front & rear of the truck, then torque them all.

 

that's a pretty rough pinion angle. i cut some of my best 60' times on an angle about like that though it needs to be fixed anyways. hope it fixes your lean at the same time.

 

I have a slight shudder taking off from a stop, and high frequency vibration 15-25mph. No other vibrations to speak of. I'm going to remove the 2* shims and install the Belltech carrier bearing relocator I have soon, maybe this weekend.

 

Id flip the shims but it probably still wont be enough.