Strange Noise????

I'm concerned about a noise I have been hearing since I lowered my truck. The noise seems to be coming from the rear somewhere, not quite sure where as it only does it when the truck is moving under power. The truck is lowered in the rear with mono leaf and helper spring and 3 inch blocks, in the front it is 2.5 inches lower than stock by cranking the torsion bars. The sound is like a light metal clanking that gets faster when the RPM's raise. It only does it when the truck is in gear (manual trans) and going down the road under engine power. I can hear it in first through forth gears, not fifth. Could it be the Carrier Bearing? I don't know what one of those sounds like when it goes out, but that is my un-educated guess. The noise didn't start right after I lowered the truck; the day after it had been lowered is when it started. Do you think the angle of the driveshaft could be off? I haven't seen anyone saying they had to shim their axle with this type of lowering. Any help or ideas would be greatly appreciated. Thanks

Could be a few things. Id check the u-joints, carrier bearing and see if the driveshaft has been pushed in farther to the transmission causing it to rub.

I'll have to check the U-joints. Does any one know how much they are to have replaced?

There is a very good chance that youve got a bad u-joint man, I had one and it didn't make any noise until I static dropped it lol. U-joints will run you like 18-25 bucks a piece, Im not sure on the price of the carrier. And I'll be up in Salt Lake again this sat if you need any help with it man let me know

The center U-joint was siezed up, so I got that replaced. That took care of the vibrations and most of the clanging. It's still being looked at to find where the clanging is coming from.

88EXT22 let me know When you get to SLC, maybe we can meet up somewhere.