Yes the 8.2 from the 5th gen should bolt right in. I haven't done it myself but
@
Drift Monkey
and
@
TheHennDoggg
have both swapped in 5th gen axles with elocker. Look at both of their previous posts and especially TheHennDogggs build thread, I believe he got his rear end for $220 at an LKQ since pull your own rear axle is a flat rate.