I have a 1993 240 - with automatic transmission which was just re-built this week (according to the mechanics, the transmission was full of shavings and needed to be rebuilt - I might have been a sucker). Fuse #12 was already blown when the mechanics had the car -so they didn't hear this noise. They didn't have any of these fuses, but I did at home, so I replaced it when I got home. When fuse #12 is NOT in place, the transmission seems to shift without noise and seems smooth (but windows don't work and need to press Shift Unlock button to get out of park). When Fuse #12 is in place and connected, the windows work and shifter works w/o button needing to be pressed (reverse lights don't work though) - BUT I do have a horrible noise when shifting through the gears and from reverse back into Park it will grind and die. This also happened last week before the transmission was re-built (which made me think the mechanic was right and the transmission was jacked up). But now that it is still doing this when Fuse #12 is connected, it indicates the problem is something else - ANY IDEAS ON THIS??? My wife is not happy because I have sunk too much money into this car - please help me get this fixed so I can get out of the dog house.

Before all this really started, I had taken the car to a wash to try to get a bunch of oil off the undercarriage (had some bad gaskets I had replaced and it was a real mess underneath. I did spray in the engine compartment (not full force, except down lower by the transmission - lots of build up) Could I have sprayed something accidentally in the engine area that messed this up?