bigreds1963ss

i am looking to install my avic d3 in my 2007 new body style silverado crew cab and would like to know where the vss is, i purchased the wiring kit from crutchfield for the door chime and stuff for the non bose stereo. thanks

I AM LOOKING TO BUY EITHER A D2 OR D3, WHICH ONE IS BETTER, EBAY HAS A NEW D2 FOR 599 OR A D3 FOR 699, IS IT REALLY WORTH THE 100.00 FOR THE D3, DOES THE D2 PLAY DVD'S IN MOTION, WHAT WOULD I GAIN WITH THE D3 VS D2, THANKS