I'm not particularly technical with gearboxes and stuff, but it didn't sound like slipping to me. When the accelerator was pushed, the car attempted to kick down, but the revved just increased, but the car was slowing down. A gear only engaged when the car had been stopped, put into park and put back into drive. The car slowed down from 85mph without engaging a gear.
We are taking it to the dealer this week, so I will keep you all posted.
Thanks for the responses
---My Previous MBs---
87 300SE (Sold) - Black, Cream Leather
89 300SE (Sold and missed) - Black, Cream Leather
87 420SEL (Died!) - Bronze, Black Leather
---Father's Previous MB's---
2004 S320 CDi - Black, Cream Leather, 18" AMGs
2001 CL500 (Stolen!) - Black, Cream Leather
1999 E55 AMG - Black, Black Leather
1994 500SE - Black, Cream Leather
1990 300SE - Midnight Blue, Cream Leather
1986 420SEL - Diamond Blue, Cream Leather