what is the highest rear end gear ratio rcomended for 72 chevy truck?

Savage Henry

New member
Bought a 72 c/20. I will be using it for camping. I will not be pulling anything and will have it on the highway quite a bit. increasing the rear end gear ratio is more cost effective than purchasing a 5 speed trany. What would be the highest ratio i could go with? I want better top speed and fuel economy for long trips
Thanks
 
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