Shudder, vibrations, Shakey on the highway

This is for my 92 Chevrolet Lumina APV. It has the 3.1L and 3 speed automatic. I have replaced the front drive axles, the front and rear suspension, tranny mounts and have had the front end and tranny serviced at the dealer. I have also had the rims checked, and for good sake, replaced the tires with ANOTER new set. I have also just changed the complete braking assembley.
For some reason, at about 100km, the van starts to get a vibration through it. It is at the point now, I can't go over 120km and the whole van is shaking.
It is not torque convertor shutter or un-balanced tires. I am starting to think a bad or loose wheel bearing. Is this possible to be and still not have that typical moun sound that a bearing makes?.
Thanks ahead.

hi im having the same problem,please let me know what u find out