Sorry I didn't explain my self clearly . I didn't change ratios. I replaced worn gear set with same numerical ratio .the differance being 4.10 to 4.09 , .01 change . they were replacements
Thanks
HELP replaced ring n pinion, no other changes . original 10x41 tooth (4.10 ) with 11x45 tooth (4.09) NAPA / RICHMOND GEAR part listed as 4.10 ratio . I had a 2mph difference before and now have 14 mph difference , 74 on speedo / 60 on gps . Replaced speed sensor and still have same numbers ...