I too am intrested in how I could make the "auto down" feature work in my car (83 SD). I have used this alot in company cars and really find this handy (I like any feature that makes my life easier - I don't care if you think im nuts) Is there any other car I could swap parts with to make this work?

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1983 Mercedes 300SD
1987 Mercedes 300SDL
2001 VW Passat 2.8 AWD
2007 OM642 Jeep WK 4x4