A:AnswerSome models came with 5x7 and other models have 6x8.. the 6x8 can be replaced with a 6x9, but to be sure of the size you have, you will have to get more info of your car to be sure of its size
A:AnswerThat question is hard to answer without specifics on the truck. Does your truck have Rockford Fosgate speaker system? Do you have a king cab or crew cab?
A:AnswerSounds like a grounding issue or improper wiring, loose or bad contact wiring. Stock stereo or after market head unit? If stick, could be the head unit not knowing that better speakers have been installed and shuts it off thinking it's original speaker set up. Best buy will look at it for free I believe.