Trying to do an 80e swap with the frost harness in an 09 silverado. Im thinking im gonna need to wire in the old style nss because the newer trucks have the nss on the inside. Im trying to see if any of you have a wiring diagram so i can pull the wires and splice them into the old style nss to get the 4l80e working. Thanks

 

Looking to do the same swap soon so please keep this thread updated if you find out.

 

I did the swap without a Harness, was super easy, I realized I didn't really document it much, some info in my Project Thread: https://www.performancetrucks.net/fo...thread-518844/

Been working amazing for just over a year now

 

Frost is making an update on his harness. Hes getting everything taken care of!

 

any update?

 

We used a frost harness everything is still working as it should.

 

so you didn't have any issue with not having the PRNDL switch connector trans in the stock harness? Everything works internal to the 4L80E? Which version of the trans? early (lines are together) or the later (separated by about a foot)? Everything points to it working with the harness, but it's not .. and we're debating running wires from the PRDNL switch on the side of the 4L80E to the Frost Harness. Maybe this harness was before the update?

 

The harnesses are only good for the gmt800 series... All the gmt900 trucks just need to re-pin a couple wires around in the harness and add the extra vss. Allen Nelson told me this specifically... And he makes a harness for the swap, Nelsons performance.

 

This is the correct and easiest way to do the 80e swap on 2007+ trucks... You literally have to swap a couple of wires around! Super easy and no need for a harness..... On the nnbs trucks

 

Not for the 2009+ trucks, slightly different due to the lack of a PRDNL switch on the stock trans. Unfortunately for me, my truck had the old Frost harness from 2 yrs ago that didnt quite work and that has since been "updated" to work as plug and play (may have worked in 2007-8), so mine needs a few changes done to it ... Frost is on it!