Hi im Paul. I got a 99 Gmc Sierra 1500 reg. cab. 2wd. I want to put a posi. and do some stuff with the computer. When i bought it who ever had it before had a glasspack on it so i took that for and put a slp loud mouth on it it's nice. Can someone please yet me know how I know if there is a posi. in a truck before i get it out and put it in my truck. Thanks.

 

Thanks for the help.

 

Welcome to the site. Check out the GM section for more detailed help.

Smoke

 

welcome and have a look around.