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I have a 92 Deville that we have put in 3 used transmissions and they all have the same problem. The problem is that when you put the shifter into Drive the car does not start in 1st gear. The car has been scanned but nothing comes up. My thought was , maybe the transmision computer is putting out the signal to the trans to go to first but maybe the signal is not getting there due to a bad connection. Therefore the computer is working and does not give a bad scan. Is there a feedback signal from the trans to the computer that tells it it's in 1st gear? The car will go into 1st with the gear shift. Hard to beleive we have 3 bad trannies. All help appreciated
The Flashman
 
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