Does my 2004 Suburban have a VSS wire?

[nate360t]

I got a Delphi TNR800 and the instructions say that I need a VSS wire and the unit did not come with that. Does my 2004 Chevy Suburban have that already installed? My Suburban has all of the options except Nav. Will the nav work with out that? How do I get my old radio out the wires seem to be stuck.

Please help!

THanks!