[Mike C]

My 70 GMC big block truck had the 3.54 geared Dana 60 and I ran 265 75 16 tires and it was pretty good combo for the road.

Expect to pay $250 for a set of gears, another $150 for bearings, and $400 at least for labor to set up a diff. Figure anywhere from $500-$900 depending on what you want for a traction device.

Obviously, you can save money buying used if you can find the right combo in the time frame you need.

Most likely a later model semi-float 14 bolt will have a Gov-Lock limited slip installed. While not my first choice, I am still running it in both the swaps I’ve done. And the 9.5” version appears to be much more robust than the 8.5” “Gov-Bomb”. Depending on your abilities, the later axle can be done fairly inexpensively.