Technical Rear axle for 53' 3100

Hi, I 'd like to install a new rear axle on my chevy, so I have find one from a 79 firebird and one from a c1500 between 80' and 90'
According to you which one is the best and the easier to install?
Thanks

 

if memory serves, you want between 58"- 62'' wide.

BigMike

 

some things to consider....what are the gear ratio of both rear ends? how will those gear ratio's work with your engine/transmission choice? how wide are both of them wheel mounting surface to WMS? how wide is the stock rear end? what size tires/wheels do you plan on running?

 

my actual axle is 58" wide, i just want to replace it to put the truck on air because mine is in one piece without "articulation" if you know what i mean