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    1. #1
      Join Date
      Jul 2005
      Location
      Marshall , MO
      Posts
      695

      4l60e no 3rd or 4th gear

      Working on a truck for a guy he has ls with a 4l60e the harness and PCM is for a 4l80e. The PCM has been reprogrammed by street and performance. The tranny plug has been repinned and the correct pins and wires added. The problem is that the tranny will not shift under throttle if you let up it shifts fine. It will manually shift from 1-2. When it hits third the engine just revs. If you punch it it will down shift into second but as soon as you let off it shifts back to 3rd and is like it is in neutral. The big question is, is it the PCM or tranny? Also there are no CEL codes that call the tranny.

      Thanks

      Brad Shepard
      69 Malibu
      Marshall, MO






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