Upsizing tires and speedometer

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Dec 9, 2009 | 12:27 PM

enosez

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Upsizing tires and speedometer

Ive tried searching but cant seem to find anything.
I have a 94 f-250hd that came with 235/85 16 tires.
which is a 31 1/2"tire.

I want to upgrade to something a little larger.
How do I correct my speedometer to read correctly?

Dec 9, 2009 | 01:11 PM

Hitokori

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Joined: Nov 2009

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u can change the gear in the rear end or Speedometer Calibrator - JCWhitney .... and TRUSPEED CUSTOM-FIT SPEED SENSOR CALIBRATOR - JCWhitney .... one of those withh do it for u

Dec 9, 2009 | 01:17 PM

darthice

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hitokori you dont even have to do that there is an article on this site that shows you how to reprogram your speedometer for the larger tires. y spend money when you can program your dash for free

Dec 9, 2009 | 01:30 PM

darthice

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HOW TO RECALIBRATE THE SPEEDOMETER ON 92-96 FORD F-SERIES AND BRONCO .: Articles

Dec 9, 2009 | 01:34 PM

Hitokori

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... oh well see my truck isnt that new mines just 88 model

Dec 9, 2009 | 01:46 PM

darthice

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well you know it happens man lol only reason i knew about it was i got bigger tires and had to reprogram my speedometer also

Dec 9, 2009 | 01:55 PM

Hitokori

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yea i think my only options are the uhm ratio adapters or something like that or is their an easier way? coz when i get my 33s and im doing 70 (by the speedo) ill actually be doing 82..... so u c how that can be a bad thing lol especially when i get OD in it and i can go back to doing 85 lol