98 w900 very bad death wobble

So Recently I changed the front shocks, drums, shoes, air chambers and s-cams. All this in the last month.

Ive noticed that ive had popping going on in the front end so we determined that the leafe bushing were bad. When I disconnected my trailer and took the truck over to my mechanics last wednesday, it was the first time noticing the death wobble. This is happeneing at 30mph. So got my truck back today with new leaf bushing, pins and leaf springs (the springs were bad and wouldnt allow new bushing) and drove it back to my lot and that death wobble is still there at 30mph. I would say 90% of it is felt in the steering wheel but the whole truck is vibrating. My mechanic also checked the steers for being out of round and everything checked out.

So truck is back at mechanics and will be looked at again in the AM but Im curious as to what this could be.
Any thoughts?