I'm wondering how hard is it to replace lug bolts on a '70-72 Dana 70 dually axle from a Ford F-350? And would you guys know what ratios could this possibly have? Thanks

 

You have to remove the axle, lock nuts, & brake drum to get to them.
There may be a axle i.d. tag on one of the pan bolts.

 

You have to pull the hub to get at the studs keep in mind the studs hold the brake drum onto the hub. You drive them out and tap the new ones in then take a lug nut and a spacer under it (old deep socket turned upside down) to seat the studs in the hub.

Its a piece of cake changing the studs the biggest part is pulling the lock nuts off and bearings out and changing the oil seal that you can never save.