I've been trying to track down a case of death wobble for a month or two now. The truck drives well on the highway + around town. However, if I hit a moderately large pot hole between ~35-40mph the steering will start to shimmy and left unchecked it will get uncontrollable until I slow down. If I jerk the steering or change speed I can usually get it to stop before it takes over. I have checked the steering a few times now and everything seems tight. I aired the tires down to 10PSI to load the steering while turning and the drag link/tie rod ends have no perceptible play. I also checked the trunnion bearings by jacking the truck up and using a pry bar to move the wheel up and down - no perceptible play. Wheel bearings are also tight. When I was checking the steering by having my wife turn the wheels left / right I noticed the bushings in the track bar were flexing left right. The upper ~1/8in and the lower ~1/16in. These are OEM bushings that are probably 3 years old and have ~30K of road/off road on them. Is that too much play? I'm surprised they would be worn being relatively new / on a vehicle that isn't a daily driver. Any other suggestions to check? It didn't do this previously, so its something that has developed over the last year or so with not changes to tires/suspension.
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