My question is my friend wants to sell me a rear that he said is a 8.5 with 3.42 gears posi now i have my factory 7.5 with 3.73 he said i wont notice much of a difference from the 3.73 to the 3.42 gear is this true and is it worth me buying his 3.42 posi im tired of the one legger burn out lol or should i just wait and buy a 8.5 with a 3.73 or 9" for $900 im not going to be racing but when i decide to put more power i want to know my rear can handle it.