I have a 1981 300SD W126 that needs a new transmission due to extreme slippage. I dropped the trans and when replacing the rebuilt one that I got from a close friend I noticed that the hardware that links from the SD to the speedo sensor is electronic. The replacement trans has a female mechanical speedo sensor. from the SD to the new trans it is not compatable. I noticed that the housing can be taken apart from the back where the drive comes out of the trans and meets the flex disk. My question is; Can I take off that housing and swap it for the old one on the other old trans.....or is there something more complicated mechanicaly inside to prohibit me from doing this? Do I need an SD trans with electronic speedo sensor or and swap it for a mechanical speedo sensor? thanks
-Stephen

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68 250s SOLD
78 300d non turbo SOLD
1980 240d manual SOLD
1981 300SD 360,000 miles I think she's doomed for a parts car but has a good engine SOLD the engine to spamman
1977 300d non turbo SOLD
1985 300SD california car
1978 240D Manual

Not quite sure but I know that tranny came from a 123 or a 116 not a 126. I was under the impression that the SD picked up speed from the diff not trans.

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

yeah i kinda figured the "new" trans came from and older chasis. the electronic component has two wires going to it and plugs into a female inlet at the rear end of the trans just before the drive comes out of the trans. with the new trans it is a female inlet but has a reciever for a mechanical speedo sensor like in the W123s

__________________
68 250s SOLD
78 300d non turbo SOLD
1980 240d manual SOLD
1981 300SD 360,000 miles I think she's doomed for a parts car but has a good engine SOLD the engine to spamman
1977 300d non turbo SOLD
1985 300SD california car
1978 240D Manual