E-Class (W123) 1976-1986: 240D, 280E, 300D, 300TD, 300CD

722.3 to 722.4 transmission swap for 85 300d

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Old 11-27-2013, 10:19 PM
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1985 Mercedes 300D TurboDiesel Saloon
722.3 to 722.4 transmission swap for 85 300d

Good Evening,

I've had 2 previous Mercedes: a 97 E320 that I really enjoyed until a dumb kid ran into it. Then I had a 94 S320 that was great, but I was always dreading a very expensive part breaking, so I sold it.

I bought a 1985 300D Turbo-diesel saloon a few months back, but the first band on my transmission decided to wear out.
So I picked up a good used transmission from a guy near me inexpensively. Then I realized the transmission I have under all the grease is a 722.3, and of course since I'm in California, the transmission I have is a 722.4.
The difference for fit I see as the neutral safety switch. Both appear to have 4 prong connections.

So, a couple little issues to resolve, and please feel free to correct my assumptions.

1. Are there any other conversion issues I have to contend with?
2. I believe I will need a 722.4 safety switch to add to the transmission I have to make the conversion.
3. Is the electrical connector able to be changed out, or cut and re-wired to match the 4 connectors for the switch.
4. Or, is all this going to be a massive issue that I should just go back to finding a 722.3 transmission and sell off the 722.4?

Any other words of advice in this transmission transition?

Thanks, Ken
Old 03-21-2014, 01:12 PM
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1999 E300TD
Much water has gone over the dam but how did you solve your transmission conundrum???

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