Chris,
Thanks for the info, but it does not sound like that! It sounds more smooth, and not as loud... I don't know how to describe it... just like a smooth constant rattling... and it must be coming from inside the engine because nothing is loose in the engine bay at all. I have checked and it does sound like it's coming from the engine. Kind of frustrating...........!

Does anyone know the cost of replacement of the reverse piston seals and the reverse friction discs? Thanks.

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)