Hello I am new to this forum & new to MB. I just acquired an 83 240D 177K automatic transmission (2 owner, last owner since 1991 & 91K), after the purchase I changed all fluids & filters, including the automatic transmission, the transmission was slow and not very positive before the oil change & and after it did improve some. Everything was still ok till I washed the engine. Now it will only shift when at maximum RPM, which I assume is the governor in the transmission. I was wondering if someone here has had this problem & an idea where or what to look for? I have read through the searched topics and will check all these out tonight, but I still did not see anything about the electrical connection on the trans. I can see what looks like an electrical connection passenger side towards the front & a vacuum connection on the rear. Does this problem sound like vacuum or electrical? What is the best way to check both? I know there have been vacuum leaks as some of the vacuum lines have been plugged (locks & cruise). Also what is the best way to check for all vacuum leaks? I like to do all my own work except I have never been past the filter in an automatic. Thanks in advance for help.