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Discussion Starter #1
I recently bought a 2006 CRV auto trans with 155k miles on it. It looks like it was well taken care of for the duration of previous owner. I noticed that during acceleration only between 15-25 miles per hour that I get a shaking/shimmy/shuddering under the driver seat. There is no vibration in the Steering wheel at all. It starts at about 15 mph, peaks at its strongest at about 20 mph and tapers off until it hits 25 and then nothing. Trans shifts smoothly.
Things I have done in the past few months after buying the car:

2 drain and fills of trans fluid with Honda fluid about 1k miles apart.
drained and fill of rear axle. honda fluid
exchanged some power steering fluid. honda fluid
new pads and rotors on front
changed serpentine belt
changed drive side mount hoping that would help but no difference.

The previous owner had the front axles and shocks replaced along with new tires shortly before selling.
I have driven this car for about 5k miles now and it drives great other than that particular speed. Highway speeds there are no vibrations at all. So, Im a bit perplexed. Just trying to see if its anything I can or diagnose myself before bringing it in.
thanks
 

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It could be the torque converter, my 2005 was doing the same thing and my local mechanic determined that was the issue. He told me $1500 repair.
 

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Discussion Starter #7
does it happen at a specific gear and rpm range/speed? It could be the tq converter

Not a specific gear, but speed only-> could be the axles. (Also do you know if the axles were OEM or aftermarket?)
I assume the axles are aftermarket since the seller told me he had them done at a local independent repair shop. I dont see anything denoting they are honda brand but looking up the strut part numbers they are detroit axle brand all in one model. I dont like assuming but I know the seller didint put in a lot of money into the parts in order to sell it.

The vibration happens right after shifting into the first gear from a stop. Then, its peak shaking is about the middle of that gear and softens up completely right right before shifting into the following gear. Ive tried just easing the foot on the pedal to slowly drive as well as giving it a good amount of gas and each time the result is the same. Its just more noticable as slower acceleration it seems.

I tugged on the propeller shaft and it feels tight. there is some give at the bushing in the middle but bushing looks good. Also some give where it starts from the trans leading to the U-joint but feels tight. U-joint doesnt look broken.
 

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Discussion Starter #8
Just an update that this is now fixed. I was planning on getting new tires put on and while I was doing my brakes a bit ago I noticed a ball joint possibly going bad as well as some worn bushings on the control arms. Nothing was cracked full through, maybe the worst was about 20% torn. The previous owner changed out the tires, front axles and struts with the cheapest parts available. I changed out all the struts and the shaking went away by about 60-70%. I tried changing the control arms but the weather prevented me from getting too far into it with trying to break free the ball joint so I just had the local shop do it with the tires. After changing all 4 struts, all brand new tires, front control arms and front axles it drives like brand new now. Im very relieved it wasnt anything with the transmission (knock on wood)
 
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