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Do you have a new set of tires? If so, its very likely they are not properly balanced. If not, it;s likely that one of the wheel weights on one of your tires came off and your tires are no longer balanced. Try getting your tires balanced and see if the problem goes away.
Its possible you have a damaged wheel. A wheel could have been damaged/warped when the first set of tires were replaced. Spin balancing machines "balance" the tires at about 30 mph. Generally that covers things up to 60 or 70 mph on the road. You may need to have the wheels checked with a gauge to see if any are warped or bent. Make sure the vibration is not affected by engine torque or other factors. Does it matter if you are coasting at 70 mph or pulling, etc. A miss-fire in the engine could be transported thru the passenger compartment and cause the same effect, but the check engine light should come on. If the problem started right after the new tires, I would look at the wheels first.
Your front tires are out of balance or are out of round. The best thing to do is bring your tires in to a service station for a rebalance. This way the person who is doing the work will be able to either balance the tire properly and while the tire is spinning, check for seperated belts. Hope this helps.
If they have been spin balanced properly, then the wheels and/or tires are out of round or you have a bent rim. The right way to check this is to use a dial indicator and measure the runout of the tire and the rim. A good tire shop should have the equipment to measure this. There is always some radial runout (difference in distance between the center of rotation and the outer surface, both on the tire and on the wheel). When the tires are mounted on the rims, If the high spots of the tires happen to be aligned with the high spots of the rims, this makes the total runout worse. If the high spots of the tires are aligned with the low spots of the rims, the total runout is better. There is a limit on how much runout is acceptable to give a smooth ride. The tire shop should also measure lateral runout, which is the side-to-side variation in the wheel as it spins, or "wobble". If excessive, this would be a sign of a bent rim. Also, with the vehicle jacked up so the weight is off the wheels, you should check for any looseness in the suspension and bearings, which can also cause vibration.
sounds like to problems did you actually hit some thing? if not the burnt smell should go away. about the bounce at 45 mph are you sure that it's not a shake and does it go away at 55 mph or different speed? if this is whats happening the front tire is out of balance weight could have fallen off. try this
relace your shocks. the design of any dampner(strut or shock design) is to return the wheel to the road for handling and safety. when the shock is worn out is with continue to bounce like a basketball. it has no more strength to return to wheel to the road. a common misconception is that they are there to absorb, not true. the springs or torsion bars are there to absorb and create ride height. the shock does nothing more then return the wheel to the road. simple and inexpensive.
I'd guess you have a tire out of balance, it sets up a harmonic around 30 to 35 mph, and at twice that speed, or 70 mph. I suspect if you drove it at 120 to 140 mph, you'd find another one. Could also be a tire that has a belt that has failed.
How many miles on this set of tires, did you get a lifetime road balance on them? Hazard warranty? How soon before you need new tires. Need to take all of these into account, but need to correct the problem before you have a tire failure and a wreck.
Tires would be the 1st place to check. If you seem to feel it more in your legs then it is likely the front, if felt more in seat bottom then could be a rear tire. Depending on how severe the vibration is there could be a tire developing a tread seperation and should be checked right away. A simple balance of the tire and wheel assemblies may be all that required also but when on a balancer they should be able to tell if the tire has a more severe problem.
Driveline components could cause vibrations also however if the above sounds like it fits then check that 1st.