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What would cause a 2012 Challenger RT 6 speed manual with 73,000 miles shake. Shakes the whole car for no reason. Just driving down the road it starts to vibrate the steering wheel . Shakes like it is possessed. It will come and go. Wheels are balanced , new,, no rotor problems . Between fourth and fifth gears you can feel it. The shifter will also shake .
 

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2020 Dodge Challenger Hellraisin Scat Pack
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What would cause a 2012 Challenger RT 6 speed manual with 73,000 miles shake. Shakes the whole car for no reason. Just driving down the road it starts to vibrate the steering wheel . Shakes like it is possessed. It will come and go. Wheels are balanced , new,, no rotor problems . Between fourth and fifth gears you can feel it. The shifter will also shake .
Could be a number of possible reasons.

Did this just come about suddenly out of the blue or after something was done to the car? Or something happened to the car? You'll be surprised at how often someone posts a question like this and after some back and forth comes out with something like "Oh, yeah, I forget to mention I hit a cow with the car."

You say wheels are balanced but are you sure? It is not unknown for this balance to be skimped on, not even done in some situations.

And balanced how? Load force balancing can be required to identify a wheel or a tire that is bad.

I assume the wheel lug bolts are all present and have been properly tightened -- star pattern -- and to the right torque setting?

Are the tire pressures ok?

Do the tires show signs of uneven wear that could arise from bad alignment? Wear concentrated at the inner (or outer) edge of one or more tires? Uneven tire wear from side to side?

Feel the tire tread surfaces for signs of feathering or signs of scrubbing.

Absent a problem from the tires or wheels a wheel bearing problem is possible. But when these go bad they generally make a noise.

The drive shaft/u-joints are suspect.

Probably need to get the car in for a visual check with the car in the air to ensure the drive shaft is ok. Also, a check can be made to ensure the engine, transmission, and other drive train mounts are ok.

A check for excessive play at any suspension or steering connection/bushing can be done at the same time.

A look at the shocks is called for too. A bad shock can have a wheel going up and down like crazy and this can cause vibration.
 

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2015 RT 5.7 M6
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What would cause a 2012 Challenger RT 6 speed manual with 73,000 miles shake. Shakes the whole car for no reason. Just driving down the road it starts to vibrate the steering wheel . Shakes like it is possessed. It will come and go. Wheels are balanced , new,, no rotor problems . Between fourth and fifth gears you can feel it. The shifter will also shake .
FYI there were 2 TSBs for front suspension issues for that year. But if you are feeling shimmies through the shifter could be a bad guibo bearing or the prop shaft dampers are shot.
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