I am posting this in the SRT6 forum because there seems to be a lot of you that do more physical work on your own cars here. My CF isn't stock and has been modified. That said I appreciate any input that might help before this noise becomes serious.
I have the automatic Limited with 35k miles. When I a am slowing down the transmission makes a clunking noise. Not all the time though. It feels like it is downshifting when coming to a stop.
Also I have noticed a loud rumbling sound (not all the time) when slowing down (just on certain roads) coming
from the rear tires. This particular noise sounds more like the tires to me. If you have gone over safety strips on the side of some highways the sound is the same. My CF is lowered with the Eibach lowering springs and I am using the stock shocks. I also have rear 15mm spacers.
Recently I went from 33lbs air pressure to 35lbs of air pressure in all four tires. I have aftermarket wheels and non-stock tires. Tire size is correct for all four tires.The tires,wheels,springs and spacers have been on the car for 5 months without any problem until recently.
I looked this up on the forum and found similar issues with other owners. Mentioned was the possibility of a loose suspension. Also the driveshaft support and bearing. Needwings carries these. The transmission seems alright in terms of regular driving. Doesn't shift rough or clunk while accelerating. Not yet anyway.
I also have more HP with the TVT 265 kit installed. This just started and I would like to take care of it early before it gets worse. My warranty is up. It will have to come out of my pocket.

 

I also was getting a clunk when coming to a stop. Do you get a clunk when your traveling at about 30-40 mph when you completely take your foot off of the accelerator petal then apply pressure again? If so your differential may look something like mine.

 

Yes, exactly. Not all the time though. What do you mean that the differential may look something like yours. Have you had any problems with your differential.

 

Look in his gallery. He has pics of the differential in there. Does not look pretty.

 

If you indeed had a differential failure similiar to mine you would also notice when you park on uneven surfaces the car might roll a few inches forward or backwards. An easy way to test is just have the car lifted up and if you can twist the axle clockwise or counterclockwise then most likely your pin broke as well and has begun twisiting the pinion inside the differential.



test it out and tell me if you have any twist/play in the axle when the car is parked.

Mine was luckily still under warranty and is being rebuild by a company called Dahmer powertrain INC. no personal experience with them but they were picked because they are close to where i live and gaurantee their work with a 3 year unlimited mile warranty at a fraction of what a full rearend from the factory would of cost.

 

I will put my CF on a lift. Will let you know as soon as I find somthing out. That's a mess. Did you run your car hard. Or was this done from repeated track runs. Even so I'm not very impressed with the CF differential if this is the best it can do.
I had a 91 Miata set up with a stage 3 turbo from flying Miata and many,many engine modifications. The Miata engine I used had 50k on it when swapped. My best 1/4 mile time was in the low 11's. It was a monster. The tranny was bone stock. Except for the clutch their were no modifications. This was also my daily driver. I drove this car hard for 2 years with out anything happening to the differential (stock) or the tranny. For that matter no problems with anything.
If this turns out to be the problem I am going to sell my Limited. With only 35k and babied miles this is unacceptable. Considering MB built this and Chrysler sold this car for 40k+ I would expect a hell of a lot more. This car had 3k on it when I bought it, and it was mint.
My 98 M3 had 200k when I sold it and never had any major problems. My original Miata engine was replaced at 180k in great condition. The only reason I swapped it was for the hi-performance rebuild with a lower mileage engine.
I love the design and mechanics of the Crossfire and will be truly dissappointed if this turns out to be a costly major problem at this low mileage. The money will come out of my pocket.