Weird vibrations in drive

[suki243]

Hey guys, I appreciate all the info you guys have been giving lately.

Now is just a concern. Recently I've been noticing that every so often when i'm at a complete stop and at idle the car has a really really weird and strong vibration. It is almost like something on the gear is off or something is on it. Whenever it comes around thats when the vibration happens. When i put the car in neutral it goes away, when i rev it a little in park it goes away, after moving forward a ways and stopping it goes away. But it comes every so often which is worrying me.

Another concern is i feel like after i take my foot off the gas pedal if it was at 2000 rpm and i take my foot off the pedal it'll drop to 1500 instead of maybe 800, and I can hear the kick down click when i let go of the gas pedal. The kick down has been going on for a while, just didn't think much of it. The sticky pedal as i call it was after the accident and so was the vibrations.

It's a c4 auto.

Recent changes: changed my speedometer cable, added some trans fluid.

 

[Ponydrvr72]

1st- maybe a u-joint,does the drive shaft make a clunk when put in reverse?
2nd-maybe your throttle linkage is getting hung up on your kick down rod

 

[6Stang7]

So the vibration happens when you are not moving, but have the car is in drive?

It stops when you either put the transmission in neutral, rev it in park, or move forward a bit and stop?

I'm not too strong on automatic knowledge, but I sounds like it might be the flex plate, torque converter, or the transmission itself.

If this started after an accident, maybe check to make sure the transmission is mounted down nice and tight. Check the mount and the bell housing.

If that isn't it, then check the flex plate and torque converter. After that, I'd guess that it's soemthing with the transmission itself.

 

[suki243]

I'm not sure if its the U-joint, the car is at a standstill.

It's possible it can be the flex plate, it needs to be replaced, its missing some teeth.

I drove the car for a bit after i got it back from the body shop and it seemed fine. It was only after I changed the speedo cable is this vibration occurring, but it maybe possible it happened before. The vibrations can be felt if you put your hand on the shifter. They're pretty distinct.

 

[rebel65]

i had the same vibration in my car off and on with a c4 all the time i just assumed it was how that tranny was lol.

 

[kilgorq]

I would check for a cracked bellhousing or a broken tranny or engine mount.

 

[Ponydrvr72]

yes check those motor mounts, i had an expensive expierence at a red light burnout. new flex fan, new fan shroud. look also for loose bellhousing bolts.

 

[suki243]

Ugh, so i took it back to the body shop that did the body repair, for a few things like shifter linkage adjustment and the fuel sender was completely off, so they'd have to fix it. They said the shifter linkage adjustment they can't do, and it looks like the transmission mount is broken would that cause this vibration?

 

[6Stang7]

It very well could be given that you feel the vibration on the shifter.