Have searched the forums on remote starts. Lots of good post with regards to Astroflex, Viper, and Clifford. Has anyone had experience with Autopage? Specifically, model 720. Local shop has this unit, two-way page alarm with all the bells and whistles, remote start, etc for $399 installed.

Thanks in advance for the feedback. Have 03 Chev D/A,CC, SB.

Make sure they use a data bypass for passlock such as this one. http://www.bypasskit.com/manual.aspx?prodid=GMDL-BP

I don't have the passlock security feature on this truck. Will I still this module?

Yes you do have passlock security. All GM trucks since 98 have passlock. You can not order it without.