I was reading over the writeup on the 4l80e install and was alittle unsure about the vss wiring. When I get the speartech harness which comes with the main plug adapter and the vss harness do I just hook up the front vss with the new plug that I got or do I also reuse my stock vss plug in the rear of the trans. So another words do I have to hook up both vss on the 4l80e? Or do I just have to run the new wires that come with the harness from the pcm to the trans. Thanks.
If you are installing the Speartech harness it should be a snap. Those guys know what they are doing! I've installed a few different harnesses they have built for different applications and highly recommend them.
You would plug in both sensors if you are running a Factory PCM.
Ok so I just plug my new speartech vss harness to the front vss of the 4l80e like the writeup says and put my stock plug into the back of of the vss? Im going to be using the factory pcm with a hp tuners rewrite from 4l60e-4l80e.
Yep, do that. I don't think you'll run into any issues.
I have not run into the symptoms described in the write up personally. If you do, disconnect the battery for a few minuteds in order for the PCM to reset and connect the harness as described in the sticky referenced here and see what happens.