I have an '03 Silvy, with the 4.8 and 60e. I have a stock truck, but have issues getting traction when I launch. I have a stock rear end, with 3:42s and and open diff. I'm not looking to do gears right now, just need some more traction. I have hear limited slip is good, I have heard posi is good, I have heard lockers are good. What are yalls suggestions?