Hi!

I'm feeling some vibration in the car as soon as I reach 40mph. Then the vibration is decreasing for each mph until I hit 50mph and then it dissapears.

Does anybody know what it could be? Could it be the driveshafts?

 

I would start with a wheel balance and then an alignment. Good luck.

 

+1, start with the easiest (and cheapest!!) solution first

 

check wheel balance, alignment, and brake rotors first to make sure things are running true. also check to make sure the tires dont have any flat spots if the car has been sitting for a while. From there check the inner and outer joints on the steering tie rod assmebly for excessive play or damage. those are your cheap fixes, then its off to examine drive shaft coupler and shafts.

I have had the same issues and found that the sliders on the break calipers were binding up and sometimes casue the break pads to rub the rotor on one side. The tie rod ends need to be replaced at some point as they are showing signs of wear after 127000 miles

 

Take to a tire shop with a " road force balancer " this can find and often fix issues with tires haveing bad spots in them. I had a similar issue with mine when I bought it. Both front tires although close to new were crap. One had a busted belt from hitting a pothole and the other had soft spots in the sdie wall plus was cupping both had under 1k miles. Also found a small bend in the right front rim but replacing the tires fixed the issue. Mine vibrated between 63mph-70mph. Now itw smooth as silk.

 

Hmm, steering tie rod assembly for the SRT6, you got the part#?

 

The thing is that the vibrations wasn't until now. I have barely used the car. Kind of strange

 

I lost a wheel balancing weight on my Galant. That created a strong vibration at 70mph, which is unfortunate considering that's our national speed limit. Disappeared past 90mph, "I'm sorry officer, I was speeding to save my teeth from falling out". Took it in for a wheel balancing and alignment and now everything is perfect.

 

Try the road force balancer i suggested most shops will do all four tires for 30-40 bucks thats the least expensive place to start and the most common source of vibrations.

 

ive seen that issue on a srt6 with 190,000 miles, ended up being the torque converter

 

I hope its not the torque converter, my car has only 25000miles.
Have ordered the wavetrack lsd, after that is installed I will try to investigate what it could be starting with the wheels and alignments.

Is there a way to see or test if the torque converter is ok?

 

we were able to disable it with the star das laptop and the vibration went away, re-enabled and the vibration came back. this was a couple years ago so i do not remember his bill offhand but it wasnt pretty, not trying to scare you, just giving a fresh opinion, he had the same symptoms.