this is with factory h1 wheels (something like 7" bs) i measure around 75.5" with the h1 37's tire to tire, factory width chevy dana 60 (69.25 wms or something close to that). The only problem you run into (like i am) is that with this offset your hub on the 60 will protrude further out than anything else. With warn hubs i'm around 79.75" hub to hub, and with the factory lockouts it is 77.5" hub to hub. I am running leaf springs in the factory chevy location and with the h1 37's i have about 2" clearance to the leafs with the steering on the bump stop.
here's a good pic of the warn hubs.
i know its a toyota, but it will give you an idea of how narrow you can actually get them without narrowing the axle.