- Joined
- Feb 28, 2008
- Messages
- 442
- Reaction score
- 2
- Points
- 0
- Age
- 63
- Location
- Crawfordville,Fla.
- Vehicle Year
- 1984
- Make / Model
- Ford
- Engine Size
- 2.8 duraspark
- Transmission
- Manual
I hope I've got this in the right forum. I know nothing about rear end gearing and was wondering if changing it would affect MPH. According to the door sticker my Bll came stock with 195/75R15, I put 31x10.5R15 on it and the speedo is 5 mph slow according to gps(55=60). I checked a tire size calculator and it showed it should be 60=51.3. Could someone have changed the gearing before i got it and how could I find out.
http://www.1010tires.com/tiresizecalculator.asp
http://www.1010tires.com/tiresizecalculator.asp
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