Re: 4L60E Trans only shifts 2 and 3
I am having this same issue with my swap. My combo is a 5.3 4l60 from an 03 Silverado, harness and computer are from the same truck. I attached a screen shot of the codes I have.
It was all working fine then as I was driving I heard the rpms go up and it quit shifting. Fluid was 2 qts low but I have no visible leaks. I checked power at the trans and I'm only getting 10.6v. I've been told by multiple people to check the trans fuse. I don't believe I have one??
I'm in the process of tracing the pink power wire from the the trans all the way back.
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