Transmission shifts hard at times...
 

i have a 1993 300D...I recently spent a lot of money repairing my transmission...after having to bring it back a few times for adjustments to the shift module, it shifts almost perfectly now..however, at times it still shifts hard, or when it is at high RPM's and i let go of gas, i hear and feel a thump...the trans people say its a vacuum that controls the shifting on this car...is this a legit response from them??? how do i replace this vacuum and how costly is it?? also, where is this vacuum located??

thanks in advance...
Mario

I recently posted a topic similar to yours at the following link:
http://www.peachparts.com/shopforum/showthread.php?threadid=34620&highlight=126+harsh+shift

There is an explaination of where the vacuum modulator for the tranny resides. Good luck. Having mine adjusted/played with this Friday.