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Old 02-11-2019, 09:47 AM   #5
ls1nova71
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Join Date: Dec 2009
Location: Independence Mo
Posts: 4,118
Re: 4L60E Torque Converter

The VSS would be the output speed sensor. The 2008 transmission has an input speed sensor inside of it that the 2003 doesn't have. There are 15 wires on the big round plug on the newer one where as the older one only has 13, the other 2 are the ISS signal to the ECM. I'm only speculating though that that is the problem.
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5.3 swap into my RUSTY '71 C10
http://ls1tech.com/forums/conversion...71-c-10-a.html
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