Road force balancing checks for runout of the wheels & tires which is very critical when you have low profile tires. I still think that's the problem.

 

I wish you were in Florida because it honestly takes 5 minutes to check the tires. Do you have a friend with a truck? I'd take them off and then take them to a dealer to have them checked. If they turn out fine then that's great because you won't be chasing a ghost. I've personally made the statement you made when working on vettes, f-bodies, cts-v's, ssr's, and been burned by road force. In the end, it's your car and I'm just providing a starting point. You can do a search on working angles and it's not hard to measure if you have an angle gauge and some time.

 

Well sounds like road forcing is a dam critical starting point lol. Would it be cool if I road balance just the rears and see how that goes? Just don't really have the time to sit there and wait for discount to take 3 hours to balance tires.

 

I would start with the rears and honestly I would avoid tire shops in general. Discount, Wal-Mart, Tires Plus, Big 10, have all sent me several cars they couldn't get to ride good, and in the end it was all road force. Those places are nightmares!! Just drive to any GM dealer (or any major dealership) because they have the right equipment and technicians who understand the concept of road forcing. The price is the same as most tire shops and you will generally get someone who is good with vibrations. Also, I'd watch the process and write down the results from each tire. If a tire turns out above spec have them measure the runout of the rim and see if the tire can be reclocked on the wheel to net a lower number. Sometimes you just can't get them lower because the runout is too excessive and that's when you replace the tire. Like I stated before, to me anything over 20lbs rides awful on a passenger car but 25 is the spec for P tires. To me 17lbs and below is a good ride and 10lbs and below is Cadillac territory. Make sure they road force them and when you watch you should see a giant roller come down and apply pressure on the wheel assembly. Hope this helps!