Getting more road friendly?

I am taking delivery of this new to me '02 Classic that was used for bulk cement. Now the previous owner had it set up more closely for heavy haul (20k wheels up front on a 12klb axle). 24.5 tall rubber all around and the oversized front wheels. Without knowing the exact gear ratios offhand, how much of a change could I expect going with 22.5 LP all around?

 

Went over all of the maintenance records from the day the truck was sold. There is nothing in any of the paperwork to suggest that it was abused. I spoke to the Son-in-law, according to him, the larger wheels were put on to deal with less than stellar roads/locations to deliver bulk cement. I will be replacing them very soon.

 

Just found out that he is giving me the original rims as well as a set of replacement steer tires in the proper size/weight rating.

 

Looked a little deeper, the truck came from the factory with the 24.5 tires all around. I may be better off to just leave it and watch the RPM gauge for my fuel economy.

 

The drives have less than 100 miles on them. I will take a year or two to see exactly what it can do and then make the decision then.