Banging from underneath when shifting

[Budweasel]

The picture is the passenger side. I was laying on floor in front of right rear tire. Sorry I couldn't get my camera and iPhoto to play together. I have an update available so maybe that will resolve my issues.

Today I took off the Caltrac at the axle spring perch on the passenger side so I could move the axle forward. I loosened the already "not tight" u bolt nuts and kicked the right tire forward so i could center the rear end. I lightly tightened u bolts and set car on ground, then bounced the rear a few times by pushing on bumper. I then proceeded to torque the u bolt nuts to 110 ft/lbs. I double checked measurements and now have the same distance from center of front wheel to center of rear wheel on both sides. I guess the car was crabbing before so now I'll be needing that alignment Greg mentioned.

I mounted the Caltrac bar onto the spring perch and went to adjust preload. The "bushing" on top is already against the top of the spring and I'm unable to adjust the bar, (I don't own a 1-1/8 wrench yet). I don't know anything about these things so I'll read up on adjusting them in a thread a found at yellow bullet forum. If I can't figure them out they will go away. I'm not sure they are helping anyway with the wheelspin I'm getting.

Something I didn't notice before is one nut is missing from the bottom shock mount on passenger side. The drivers side has a nut on both sides - passenger side just has one nut on the front side.

I will button up the rest of the loose / missing hardware tomorrow. Then I will borrow, or buy, an action camera so I can get video of the rear in motion. I will share with you what I am able to capture. Might be a few days though. Hopefully I can find a place to mount it that captures some evidence.

If this is in the wrong section I apologize. I thought it was a driveline issue... now I'm not sure.