Improve gas mileage in a 1990s chev pickup truck

I have a 1990 Chevy 1500 pickup truck two wheel drive

Question : I currently have a 410 ratio, I need to Improve gas mileage, what do you recommend ?

Answer : We recommend 373 Ring and Pinon Ratio, you will need the following parts GM8.5-373T = $225.00 and Bearing kit R-10-98 = $108.00 plus S/Hfor additional information call Jim 1-800-444-0755