lower casing drive

[lemuechase]

I would like to replace my lower casing drive with a bigger or heavier load casing drive to accommodate the heavy load that I am presently experiencing with my boat. Is it called a "bigfoot"? I am told this would extend the life of my 60hp engine and save fuel. Please send me a quotation including the propeller information to fit the above.
My boat engine is a 2004 F60TJRC Yamaha outboard 4 stroke.

[99yam40]

When I looked up Bigfoot lower unit it references to Mercury not Yamaha

Why not just prop your rig to meet the proper WOT RPM