Private Seller Frustrations
I’d also like to shout out (and brag a little) that I have the privilege of living in the same city as the legend himself, bbirdwell. My first round of ownership included a couple visits from him personally and I am eternally grateful for it. In the world of social media and declining relationships, it’s so refreshing to come in contact with people who genuinely care and are willing to educate and share in their experiences. So, thanks again bbirdwell and hopefully this time around, I can leave you alone!
Last edited by Jake528; Dec 11, 2025 at 08:56 PM.




R.K.




They're almost certainly getting mobbed by a mix of "3,500 cash today, get it ready" and "10k for a 20 year old car???? are you crazy????????"
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I have a black one and a white one. I am looking for another nice color.
thanks
Samw124 I hear you but listen to this story on a dealership sale. My son was looking for his dream car for about 10 years LOL and finally had the money. He tells me he found one at a dealership local to us so I'm like hmmmm. He sends me pictures with all the info and I scour threw them. Something is not right. The price is great plus 60k for miles but the car is NOT what they are claiming it to be and I tell my son we have got to go look at it. If you guys know anything about a W204 C63 car's there where standard C63's,P30,P31,507 and Black series. They are advertising a standard C63 but I come up with a P31 from the Vin which is a HUJE step up that has many 507 options. This car turns out to be a factory monster but we say nothing to this knuckleheads and they do not know this some how. I then start the car...it stinks/smells. I say to the sales guy there are no cats on this! He says yes there is but they put it on the lift and guess what, no cats. I now inform them that this is federally illegal to sell but we work a fantastic deal, no questions asked, sign an agreement and out the door we go !!!!
So long story short I hate dealers but this one slipped threw the cracks and ended up in our laps so one positive review for a dealer for me !! Just one. LOL
Last edited by SICAMG; Dec 14, 2025 at 09:01 PM.




I havw a white one and a black one and a cls55. Id like to add a bit more colour
Your car certainly sounds like a very nice example. Looks very clean
😎
I do need to address a few things. The supercharger pulley sounds loud. I remember my stock bearing exploding one day in the driveway, so I need to address this one. I didn’t have a smaller pulley so not sure if they’re any louder than stock?
the biggest issue is a pretty significant vibration. Transmission was rebuilt ~1k miles ago by a legit shop using southern hot rod parts for an OEM+ spec, stock converter. In neutral revving there’s pretty significant vibration. I know the car has aftermarket motor mounts but to me it feel like more vibration than that. Additionally, at speed it feels MUCH worse. Anything north of 80 feels like your teeth will fall out. It’s a pulsating type vibration, say 2 seconds off, 1 second on and I feel it almost everywhere in the car (seat, floorboard, steering). I’m going to jack the car up this weekend and peek at everything but I’m nervous it’s something major. The tranny shifts strong, motor pulls hard, suspension was very competent on the drive home so I’m racking my brain. A transmission mount would be the best case scenario but not sure my symptoms are consistent with that.
About 1 mile into Texas I hit a pothole on I35 in a construction area and blew out the front passenger tire and cracked the wheel. All the shops around were closed so I limped home 350 more miles on the space saver. I’m surprised by how well it handled it but I took it slow. Hopefully this is not foreshadowing my future experience with the car lol.
I’m still very happy with the purchase and look forward to getting dialed in over Xmas!




I hope you have fun getting everything running smoothly.
Vibrations could be prop shaft donut or whatever it's actually called.
Engine mounts for sure should be checked
transmission mount
Center bearing of prop shaft.
Just my own knowledge from a few years. Many people on here havw been working on these cars for 20 years so hopefully u can get more info.
Engine wise look very closely at the engine harmonic damper for any wobble with it then start chasing engine mounts.
If driving it gets worse, than could be possible out of balance wheels, center bearing or bent rim. Do one thing at a time and keep track of it.
Last edited by SICAMG; Dec 17, 2025 at 06:35 PM.





Listen to Gary (SICAMG) as he knows his stuff.
Could replace the supercharger pulley bearing as pre-emptive maintenance. I think I have a couple of spacers around but I need to look. Haven't needed them in years....
My .02? At idle and revving I would suspect motor mounts. At road speed, I would suspect driveline. It is possible the Guibo joints were replaced but the driveshaft was not installed in the same rotational position You can always put the car up safely(!) on jack stands, put the transmission into drive, and run the car up to 90 mph indicated while moving a piece of chalk close to the driveshaft to see if it is out of balance. Scary but doable. I've only done it twice so your experience may vary. Long hair ponytails not recommended.
Let me know if I can assist.
Last edited by bbirdwell; Dec 18, 2025 at 09:50 PM.
I was told pulley is a 72mm, and I can’t find anyone who currently makes that size. I need to verify the outside diameter to confirm, but have no idea where to source the bearing for it. I wonder if I’ll have to purchase another complete pulley instead.
On a side note to anyone who is thinking of this I put a Creative steel transmission mount in and it absolutely vibrates at a certain rpm in park or neutral ,very subtle but there, and switching back to stock, no vibration so just my two cent's if you where to buy one. It does keep everything locked in place for high horsepower though so that's why I put it in.
Only bummer being under the car is seeing a pretty decent oil leak. I’m going to degrease everything and see what I can find. Overall much happier now, and only $70 out the door thanks to Birdwell’s guy at the dealership! Thanks for the shoutout!




Only bummer being under the car is seeing a pretty decent oil leak. I’m going to degrease everything and see what I can find. Overall much happier now, and only $70 out the door thanks to Birdwell’s guy at the dealership! Thanks for the shoutout!
And, if Keyless-Go, keep fob far away from the car when reconnecting the main battery.




