hello everyone i have a weirdest problem in my truck. i have 2000 silverado, 4WD, IFS front. in general, it does fair. has 76K miles on it. shocks seem to be ok. steering appears to be tight enough, no excessive play. no noises coming from the front end, only the infamous steering shaft clunk. anyways, it is not always repeatble issue, but if i go uphill, with front wheels slightly turned left, at anywhere over 50mph, and hit a slight bump on the road, enough to bounce front wheels up into the air - the whole entire front end can go into uncontrollable shake. it is both sidewise and up/down wise. slamming on brakes helps. it is a pretty major shake, depends how fast i go. i had that happen around 7-8 times so far, on a specific bump - 3 times. it is hard to describe, but somehow it feels that wheels bounce up in the air, shake sidewise, and then pickup on amplitude of that shake, like as if going into resonance. have no explanation why, just feels like it. maybe because it feels sort of rubbery bouncing in the steering wheel. i flashed light under the front end, everything appears to be in good shape, no leaks. i had alignment done maybe few mths ago, they always check tierod ends beforehand, had no concerns. i let it go for some time, as it was very specific to a nearby area on frwy, so just learned how to approach it differently, but i had this happen twice this week, and it scares the **** out of me, so pronounced is it. almost like lowrider bouncing on hydraulics. once again, it just feels like wheels go into resonance after bounce. any ideas? i am not sure i'll get reply notifications for this post, so if you could, please, email me direct to firstname.lastname@example.org? what can cause this or what to check on? i am very good treeshade mechanic, no problem doing so. why do i have that strange feeling that it's just made this way?