The 3100 axle will bolt directly up you your 3600 truck.
The 48 axle is going to have "Huck" Style brakes though, rather than "Bendix" style on your 52.
There were some slight differences between tie rod ends and the steering linkages, but I don't think it'll be a problem.
The 48 is going to have knee action shocks, so you'll want to use the lower shock bracket from your 52.
As far as, what's it worth. Well, what's it worth to you? It doesn't have much value. See if he'll trade for a case of beer.
