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#1
04-11-2009, 10:13 PM
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Can Door Locks And Climate Control Affect Transmission Shifts?
The automatic transmission in my 1979 300SD W116 shifts hard if I accelerate slowly. The faster I accelerate, the smoother the shifts. I have heard that the transmission shifts partially by vacuum.
My door lock diaphrams have holes in them and the climate control servo was removed and the vacuum lines that once went to it are open. Can air leaking from the locking system and climate control affect the transmission shifts, or are they on a separate system than the transmission? I am wondering if I should disconnect the locking system and climate control vacuum lines, then plug the hole. If they cannot affect the transmission, then I don't need to do this. And then if this is the case, maybe I will need to look for air leaks from the vacuum pump to the transmission? I should take care of this before I tear my new flex discs. 
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#2
04-11-2009, 10:15 PM
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Absolutely. Any leaks in the system throw off the carefully calibrated transmission.
-Jason
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#3
04-11-2009, 10:19 PM
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Good. Thanks for the quick response! Now I think I will go out and unplug those door lock and climate control lines and plug the hole to see if it helps.
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