Used tranny instead mainshaft fix?

WEll have broke down and bought a used tranny instead of trying to fix mainshaft bearing. 450. 00 , w/58,000 miles 6 month warranty . Went to hondamotorsonline and could have gotten ys-1 conversion tranny w/ 30,000 or less for 550.00 but would have lost my gas mileage steve up there said that the jdm models are geared lower …WEll opinions welcome …