Slight vibration at 20mph
 

While accelerating through 20mph, I can feel a very slight vibration when my arm is on the arm rest. I can't feel it on the wheel. Has anyone else experienced this? I don't have it decelerating and not in any other speed range

check your suspension link,Kit......could be control arms man.....this is what i was having at 50-70mph..........and check your tires( balanced through Road Force) Rim(not bent).....these are the most common problems....other than that ..the forum can help other causes....

driveshaft in balance? could be on elliptical orbit at low speeds and then get back into circular pattern at higher revs - not for long though, eventually it will spin out of balance completely... if is the shaft... could be anything else...

I was thinking more transmission related, given how faint it is, and where its happening. That said, transmission problems dont always stay tied to the speed of the car, rather when its shifting. this is very specific at 20 mph. maybe its something in the transfer case that decouples at 20mph??

Another thought is the guibo....(Flex disc)?

this seems to be getting more noticeable now that its cold. Its just strange that it happens at a very specific speed 19-21mph, and doesnt change regardless of if the car is going straight or turning. I would think it would be different in a turn if it was a flex disc.

I need to try it again with the tranny in sport mode (step) and see if that changes the shift point and therefor the speed with the vibration. That would eliminate or identify if its transmission related

I will do a full driveline refresh in the spring, but I usually dont touch auto trannys with 95K miles.