4L60e wont shift out of first
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4L60e wont shift out of first I just replaced my broken 4l60e with a 4l60e with far fewer miles and now I cannot get it to shift out of 1st. It won't shift out of 1st in D, 3 or 2. At first the speedo didn't work. I know problems with the VSS can cause shifting problems so I swapped out the VSS from the origianl tranny, which I knew worked, and the speedo now works fine. I broke the original neutral safety switch taking it off the original, so I installed a new one and had some troubles with the throttle position connection plug but have cleared that up as well. My other thought is that the "new" tranny may actually be a 98, the original was a 97. The guy I got it from said that it was a 97, but a label on it seemed to indicate a 98. If they are different years do I need to get it tuned? Are the PCM and tranny not communicating? Any ideas would be helpful.
It would not be a compatibility issue. I would scan for codes first
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