Picked up a dash harness for PW, PL, PM and a GEM from the donor. My truck is a 2000 and so is the donor. I've read on certain posts about programming a new GEM. So I'm wondering what thats all about. BTW my truck and the donor are both 2wd.

Another question, what is the need for the GEM with power doors? Is it just to control the automatic down feature?