I can get just the gears and put them in correct?

1) Where do I go for the gears, no junk yards, cuz they suck here in AZ.

2) About how long to swap them out? Is it easier and cheaper to just get a whole rear end?

3) How much 1/4 improvement would I see going from 2.73's to 3.42's. And from 2.73's to 3.73's?

If it matters I have the LB9.

 

Well I did some searching and have found some things.

First I remembered a site that I used to go to a long long time ago, tacreationsusa.com, and they sell the same complete rear ends posi/drum/10bolt for $400 or so. Is this place good? Anyone deal with them?

2nd, I'm still debating between 3.42 and 3.73. What's the difference in power and quickness between these 2?

3rd, while I continue to seach, is there a step-by-step writeup on rear end swaps?

If someone knows the steps, please tell me.

I am mechanically inclined for most things.