Tri axle rears weight rating

I've never heard of such a wonky axle rating. Normally they're 19k, 20k, 22k or 23k each.

Are you sure its not just what its registered for in terms of GVW?

 

Wow that's kinda goofy.

Changing axles is not going to be overly cheap. Probably looking at around $8-10k for a tridem cutoff from the wreckers. If you can get one with the same suspension you could cut down on the labour costs and not have a Swiss-cheese looking frame at the end of it.

Probably need to do brakes/cams/seals/u-joints on the axles and replace air bags and bushings on top of that too since its quite likely that truck won't have the 69k suspension in it either.