Appreciate the replies. My understanding is that if a wheel slips on one axle, that putting it in LOC will allow the other axle to engage anyway. Is that correct?
We'll see on the mileage. I am toying with installing an RV cam for more torque, keeping the carter carb--but with a better manifold, and installing headers to help the thing breath. I would expect that that would help with mileage as long as I keep a soft touch on the accelerator. Bob, I don't think 10 or 12 mpg is too bad for an old heavy truck like these.
Pushing snow with my F150, I averaged 6 mpg. I don't expect that this truck will do worse.