Along with the other problems im having i need to do a little updating to my 2006 Silverado LS ext cab 4x4 suspension etc... What all should i look at replacing as far as suspension/steering system go. It has 140k on it. From the looks of it nothing has ever been replaced.

 

Is it rack and pinion or conventional? you could start by jacking it up so the tires off the ground then grab the tire at 6 and 12 o clock and slightly rock it, if theres play your wheel bearing or balljoints need replaced then do the same at 3 and 9 to see if any rod ends are loose