I WAS WONDERING IS IT TRUE THAT THE FOURTRAK RIVIERA IS HIGHER GEARED THAN OTHER FOURTRAKS GIVING IT A BETTER TOP END AND BETTER FUEL CONSUMPTION, AND IF SO HOW IS THAT ACHIEVED IS IT THE DIFFS OR GEARBOX OR BOTH, AND WOULD THE PARTS FIT A F77 91 PLATE PICKUP. ANY HELP WOULD BE GRATEFUL.