I just had a shop install a used tranny from my other mechanic's 95 E320 sedan into the same year E320 wagon.

Had the shop that was doing the install replace the filter and filled it with Dex III (although generic brand).

Picked up the car today and it will not upshift (just stuck in 1st)

Any ideas? The mechanic that sold me the tranny said that I should do a hydraulic pressure test as maybe the shop did not position the TC correctly.

Any help would be appreciated - just drove it 4 miles (under 20 MPH) so I am hoping there was no damage done

You can't put the TC on wrong...it either fits or you break the pump gear trying to put it in the wrong way. Something else is probably going on.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

Start looking for another tranny or rebuild one of the 1's you have. That tranny stuck in 1st is likely toast.

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