I purchased my basically stock M1008 last spring with death wobble, using it to talk the price down. The front springs are new, I've replaced the rubber bushings with poly and fabricated beefy shackles as well. All steering linkage components appear ok. My wobble appears when either I hit the correct combination of bumps or I apply the brakes at a medium pressure. I checked my rotors runnout at 3 locations on either side and they were within spec at each point. the brake pads showed even wear as well. I had the entire axle dissasembled when I regeared it and everything was rebuilt or replaced, and retorqued correctly. I checked my toe-in and it is set at 0. I added 1 washer to each kingpin spring (approx 1/8") and the wobble reduced. I added 2 washers and death wobble was eliminated, absolutly eliminated, but my steering was all over the road from being bound so tight. I replaced my steering gearbox and checked for any cracks, none. steering was better but still too bad. I installed replacement king pin springs and bushings, thinking that would solve it. steering is now fine and truck does handle well but death wobble is back. before I add 1 shim to my new springs I'd like suggestions of what else to check. My shocks are used rancho 5000 that appear to be in good working order, so is the steering stabilizer. My hercules 235/85-R16 tires have maybe 15,000 on them and tire wear seems fine and I've rotated them once. any suggestions will taken as helpful, thanks in advance.