Okay guys, I am stumped. My rig is an 01 DC, 6Cylinder, AUTO, TRD Offroad 4x4. Almost 8 months ago I installed a ToyTec ~3.5" lift with new upper control arms, Bilstein 5100 shocks, and new OME leaf packs. I have been very happy with the setup and my pickup as a whole. However, I live in a rural area and have a recent thumping in the back that started out of nowhere and is driving me absolutely crazy. It sounds like it is coming from the rear and is definitely metal on metal. It doesn't really reverberate through the cab like bottoming out or anything. I can feel a slight vibration in my seat. It is exaggerated on speed bumps or off cantor drives that wobble the rig back and forth but also comes about with both wheels compressing at the same time but it has to be something like a speed bump to get it. A
At first I was certain it was my exhaust hitting my leaf spring but I put some clay on the spring and reproduced the sound without any sign of the clay being disturbed. I greased all my fittings, snugged up all the nuts and bolts I could find. I checked the spare tire, exhaust, heat shields, skid plates, canopy connections, trailer hitch, spring packs, lugs........ Nothing! I can't find anything causing this and cannot reproduce the sound standing on either side of the rear bumper jumping my 215 pound butt up and down rocking the truck for all it is worth.
Any off the wall ideas, boneheaded things I should check, or possible suspension issues that could cause this? Thanks in advance guys. My job is ending, three kids, and the wife just got diagnosed with MS. Getting this fixed would help alleviate the weight on my shoulders.