4L80e install issues
05-08-2011, 02:23 PM
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4L80e install issues
I just swapped from a 4L60e to a 4L80e in my 2000 RC. I bought a Speartech wiring harness. The truck has been tuned for the 80. Now when I start the truck it acts as if it's in 2nd gear and the speedo acts as a tach. I broke the pmp switch(black on the side) when I unplugged the 60. I made sure all the prongs where back in and jb welded the outside which I've done on a truck previously. Also say speed sensor input is low on voltage. Any thoughts or ideas would be greatly appreciated.
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