Sometimes a slightly bent axle can give wierd balancing problems that come and go. Need to jack up each wheel and spin them. Some care needs to be used :-)
The three times they balanced the wheels, did they ever check roadforce? It only takes an extra 20-30 seconds per wheel to check roadforce.
What is "road-force"? Haven't heard of that term before :-)
Someone correct me if I'm wrong, but i think before they balance the wheel and tire with the weights they spin it while the machine rolls a cylinder along the tread of the tire and measures how round the tire and wheel assembly is, and part of the wheel exceeds 18-25 pounds of force in a certain area they break the tire down and rotate it on the rim to try and make it more round. I also think there is another wheel that rolls along the edge of the rim to make sure it isn't bent.
`That makes sense :-) I had an old Valiant Hemi 6 [yes such an engine existed in 215,245 and 265 cubes.It was not a slant-6] The Ozzy 265 E-49 Charger had OEM 3 twin-barrel Webers, OEM headers and 280 hp. Ran 13.8 sec 1/4 mile ETs. It was at the time, the fastest 6 cylinder locally produced car.
Any way the Val was always experiencing a vibration which came and went. Turned out one rear axle was slightly bent. Because the axles were always turning in an ever-changing was to each other due the action of the diff, this gave the variable nature of the vibe.
So I def had my steering wheel shaking like crazy... and I ended up rotating my tires, and it fixed the problem not sure if your fix will be as easy, but I was surprised!
Update- I'm going to take the car back to the Chevy dealer Monday and have them make sure the wheels are balanced and get them to measure the wheel runout (they didn't measure it when they originally road force balanced them). If everything checks out I guess I'll have to get General Tire to replace the tires since I'm 99% sure the issue isn't in the car.
Yeah tks for that:-) It hilights the fact that a wheel can be oval [slightly even] still balance OK,..but when on the road, the ovality causes the wheel to vibrate as the high and low spots run against the road-surface.
I learnt something,.thks :-)
Cheap wheels > oval than better wheels. Same for tires. Generally you get what you pay for.
Well, after 10,000 miles of shaking I finally got pissed off enough to order new tires. I ordered 4 BF Goodrich g-force Sport COMP-2 tires. I'm going to get them road force balanced and make sure the rims aren't bent. If that doesn't work I'm going to borrow my stock rims off of my buddy's ZX2 and see if that fixes it. I hated to order new tires when my old ones were only half worn out but I'm tired of having a brand new car that can only go 60 with feeling like I'm riding a jackhammer. Plus, if the tires aren't the problem I'll have 2 good sets that I will eventually use.
Well. The rims are perfect, new tires were road force balanced to within 6 pounds. (25 is still acceptable, so 6 is excellent) New CS struts, centering rings, matching lugnuts, wheels properly torqued, new alignment, everything is tight and in good condition. AND IT STILL SHAKES!!! I'm fed up. I think I may go try out a Focus ST or a MS3 whenever I get a day off work/school and get rid of this money pit.
Shakes can be frustrating. How do your wheel bearings look? If there was a previous problem you lived with for 10k miles it could have beat them up pretty bad.