1998 RAV4 all wheel drive. Trans is A540H on vin tag. Need to replace rear differential, but unsure of gear ratio. Read that all 96 to 2000 were the same gear ratio. Kind of don't believe that since there are manual and automatic trans models. Also read Toyota changes gear ratios in the trans rather than the rear. Also read the ratio is 4.404:1 and read it is 2.98. All I really want to know is how to identify the proper used differential to replace mine.