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Old 07-30-2022, 06:08 AM
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W123 Transmission Question?

Question about W123 transmissions...

I have an 81 300D non-turbo sedan and on my data card the transmission number is 02 127905. I know the "02" denotes that it is an automatic transmission but is the rest of the number a serial number specific to my transmission only? Or is that number a general part number for these transmissions? For example, if I'm looking for a replacement transmission, would I be looking for another one with the number 02 127905 or am the only one that has that number because it's my transmissions serial number?

I ask because my transmission is shot and I found another 81 300D sedan and the transmission number on that data card is 02 134567. I'm pretty sure they are the same transmissions, they are from the same year/era but the different numbers through my off. Then I figured it was more likely a serial number specific to the vehicle and not a part number. Can anyone confirm?

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Old 07-30-2022, 12:08 PM
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Serial numbers.
The transmission type is 722.3xx.
The numbers are stamped into the pan rail on the right side of the trans, just above the edge of the pan gasket.
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Old 07-30-2022, 11:30 PM
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What exactly is the transmission not doing?

You can suddenly lose forward motion when your B2 piston breaks. It happened to me.
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Old 07-30-2022, 11:32 PM
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What exactly is the transmission not doing?

You can suddenly lose forward motion when your B2 piston breaks. It happened to me.
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Old 07-30-2022, 11:51 PM
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Happened to me too. While I was waiting for the tow I read your thread. I later made your diy puller tool and got the bushing out. Funny that happened a decade ago but I recalled it while reading this. Thanks for that…300D MAN.

Blew my B2 piston
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82 300SD 300k miles
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Old 08-01-2022, 12:36 PM
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Post Tranny Woes

Subscribed to find out how this ends and learn more .

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I did then what I knew how to do ~ now that I know better I do better
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