i'm the proud owner of a 77chev 4x4. i like offroading but am tired of getting stuck. i want to turn it into a true mud machine by putting in posi gears or lockers front and rear. i am interested in any thoughts, recommendations, or info on gears that would be compatable with what i have. in the back is a 3.08 chev 12- bolt and up front is a dana44. i would also like to know about lockers. how do they work and would they give similar results as posi, where could i get them? how much? etc. any info you guys could spare would be greatly appreciated.