Hi everyone. First let me thank this forum for being so helpful this far. I've had my '84 300D turbo (first time W123 owner) for less than a week and have learned so much from this great resource.

I have searched the forums and websites long and hard but I can't seem to find a concrete solution (or solutions) to my tranny problem.

First of all, when I shift from Park to Reverse or Drive, there is a substantial delay and then a hard CLUNK when it does shift. And when I let off the gas while driving, I can hear something clunk in the drivetrain. Fairly loud. There is no vibration when accelerating though, so I don't think it's a flex disc or support bearing (I don't think.) Diff mount maybe?

It also clunks when it downshifts coming to a stop, and the shift from 3-4 at any throttle input is much softer than it should be, and flares occasionally. I know that the 2-3 flare is common and fixable with the K1 spring kit, but my question is, would that kit fix this problem as well? I haven't yet pulled vacuum on all vital components of the system but I am getting there. The vacuum line from the little green check valve to that plastic valve on the injection pump is shot. That green valve may very well be shot too. I looked at the vac. valve levers on top of the engine and they don't look too bad. I think they still have a little life left.

I am going to change the trans fluid and filter tomorrow but I might hold off if anyone thinks I should try the K1 upgrade. 1-2 and 2-3 are bang on, and very crisp at WOT, but 3-4 is the problem area.

I'm pretty sure there is a vacuum issue somewhere about the car. The door locks can be finicky and very very slow at times. Sometimes the RR door doesn't even lock when I lock them. I'm starting to think that little yellow check valve may be leaking too, it looks like its the original one haha.

Any help is much appreciated,
By the way these cars ROCK!

Patrick

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1984 300D Turbo W123, 198k - The Tank
1999 BMW 328i 5-sp - The Scalpel