I have a 95 tahoe that i recently installed a aftermarket radio with the wiring kit. And the rear speakers now dont work. They did with the stock radio, but not now, any reason why? And second is i seen some ones tahoe with a pillar speakers. i think they were four inch? maybe 5 1/5 with tweeter? Are those sold anywhere? Thanks for all the help. As of right now i have two 15 inch mojos in the rear. so i need alot more mids.