Cheap wagon club member. I have a 2-3 flare that I have tried in vain to correct. Transmission is getting worse. Little bit of metal in pan/filter so I know its not long before it goes.

What I need to know is what transmission to look out for if I can find a used one. My wagon is a 1980 300TD NA. It is a 100% vacuum tranny, green modulator, no bowden cable. Are there number(s) somewhere on the transmission that tell me which one it is? What transmissions are compatible?
--- Mike

THANKS!!

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'89 300SE
'02 E320 Wagon