hey guys! my speedometer has been reading wrong ever since i bought my 2000 ranger, it used to be a consistent 4 mph off, and then i changed my rear abs sensor and it went from 4mph to 3~.
And then i recently went from the stock 235/75R15 to some 245/75R16's from a 03 ranger. and now it reads all over the place, it reads 30-35 mph perfectly, but at higher and slower speeds its off by different amounts, for example it reads 57~ when im actually going 60, but 50~ when im going 55. could this be a speed sensor issue? or do these older ones have a cable? i also have a 4wd so the speed sensor/cable is on my transfer case. and id assume that id have to get a new gears for the speed sensor/cable for my bigger tires. does anyone know where to find the right calculations to get the right tooth amount and size?
thanks yall!

 

Well hell, that is close enough for me. I rarely look at the speedometer unless I am in a school zone....LOL