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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Speedometer change

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Old May 21, 2013 | 10:55 AM
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Speedometer change

Well my truck had a lift put on it so they put bigger tires on it that what were originally on there. My dad said that my speed will be different than what the speedometer says because they are bigger tires. Would the speedometer read faster or slower than what i am actually going?
 
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Old May 21, 2013 | 11:34 AM
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Bigger tires will go farther each revolution, so you'll go fargher than your odometer reads and will be going faster than your spedometer reads. Another way of saying that is that your speedometer will read low.
 
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Old May 21, 2013 | 11:54 AM
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The speedo can be recalibrated.. what year is your truck?
 
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Old May 21, 2013 | 04:43 PM
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if you are talking about the 91 in your profile, you will need to chance the gear on the end of the speedometer cable where it goes into the transmission.
 
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Old May 24, 2013 | 11:55 AM
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Ok well thanks. Is it easy to chance the gear?
 
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Old May 24, 2013 | 12:48 PM
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yup. remove the screw holding the speedometer housing into the trans or transfer case tailshaft and pop the housing out of th etailshaft. remove the "C" clip and slide gear off, slide the new gear on, pop the "C" clip back on and put it back in.
the hardest part is figuring out what gear you need.
i tooth is good for about a 2.5 mph
 
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