Front End Shaking at Highway Speeds

I recently replaced my sway bar bushings along with my steering rack bushings. Got the tire balance and truck alignment done at Big O Tires and now the truck has a bad shaking problem at highway speeds. 60 mph feels fine but the closer I get to 70 mph, the steering wheel shakes along with the cab shaking. Around 73 mph it levels out and its smoother.

I'm using Big O Bigfoot AT tires (less than 8000 miles on them) with OEM 15" steel wheels. Never had a problem with the tires.

I've had Big O Tires rebalance the tires twice. The second rebalance made the truck a little smoother at 70 mph but it still shakes. It looks like Big O tires doesn't have a road force balancer. Should I take my business somewhere else or is there another source of the shaking?

 

How does the rest of your suspension look? (Upper and lower control arm bushings, tie rod ends, ball joints, etc)

 

have you checked your drive shaft carrier bearing? might have some sag in the bearing causing some sort of eccentricity.