Stop in for a cup of coffee

Axles are brand new from drdiff.. doesn't mean there isn't a bad bearing, i had just had the brake drums off and adjusted them for no drag cause i was testing some stuff... going to swap axles side to side and see if the heat comes with..
The pig was setup bout 20 years ago with new gears then stuffed under a shelf and forgotten, guy gave it to me for free so i can't complain but i don't think it was setup properly and i should have double checked it, guy is a locally famous hemi racer for 40 years that's retired now.. figured it would be right. i'm just annoyed and pissed.. will get over it.
The axles are different lengths side to side, I believe. Are they the green bearings or the taper, factory style? If taper, maybe have too much preload on them?

The center section, when does it make noise? During coast IIRC?