2011 silverado 1500 reg cab
 

I have a new silverado factory am/fm/cd I want to add JL speakers and a JL XD400 amp has anyone taken out a stock head unit I was wondering if it has pre outs or will I have to splice into the wiring.....thanks

Hopefully this helps
 

Yeah you are going to have to splice into the speaker outputs and install a line level input converter. should be able to pick one up for about 15-20bucks. its the cheapest way. There are other ways, but this is the easiest, cheapest, and fastest. I run a 12" stereo integrity sub, with a pdx 600 Watt/1ch. and Hertz Hi Energy 6 1/2" components, plus fill speakers in back doors with a 4/150 pdx. Two Line level converters were used to change my speaker outputs into inputs. Then able to run my RCA's directly to the amps, and from there speaker wire to all my components. Hope this helps

after a lot of research I think I am going to use a PAC audio amp interface for GM vehicles.......I have 2 new different JL amps and I have acquired and a few JL speakers.I still am not sure of how I am going to set this all up but I think I will use the smaller size wise JL amp XD400 and instead of installing rear speakers in the pillar I may use 2 6x9 speakers as I have encloserus that I took out of one of my other vehicles......it is too cold and messy out to do anything about it right now .......maybe a nice day in May I will take a day off from work and take try and slap it all together