hmm, I was thinking the wheel bearing after it happened, I had my right one replaced, but not my left.
I do hit some very very high speeds for quite a while and sometimes on a daily basis. (I-40, where it's like 7 lane and no traffic at 7:00) So the bearing has taken a beating so to speak compaired to other daily drivers...
I did start hearing a squeaking noise that's associated with speed. Not a high pitched squeak, more like a massive piece of metal grinding against another massive piece of metal. That noise could have been my E-brake shoes acting up again, I'll do my little reset trick tomorrow and see if it goes away.
Would a failing wheel bearing cause a THUD noise and feeling like that? just freaking SEIZE up like that? It happened after I got off the highway... so... yah.
Who knows, The real test is coming up in about 6 hours when I hop in my baby agin.
I'm still fairly confident my diff caused that jolt... I did slide into a curb, ruin a control arm, axle, shock, rim and rtab and the passenger side airbag deployed, so the diff has experienced some trauma. I wuoldn't put it past it for it to be failing now.