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Discussion Starter #1
hey everyone, got a question. how much would the acceleration and speedo/odometer reading change if i was to go from a 30 inch a/t to a 27-28 inch street tire without changing the gears?
 

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what size tires originally came on it?

Need some more information (year, factory tire size, gear ratio (has it been changed?)
 

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what size tires originally came on it?

Need some more information (year, factory tire size, gear ratio (has it been changed?)
why do you need more info? Bronco info: 1978 F-100 2wd; 351m with open air-cleaner, flowmaster 50, and forcibly removed tailpipe (whoops)! he has forcibly removed tailpipe(whoops). :shrug.
the only reason i quoted justin is becouse it was more funny than what you posted. 30 to 27 inch tires are like a couple of miles an hour on the speedo. the width of the tire is what maters here. ya lost me.
 

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you should see very little change, jsut go by mile markers on the highway and not difference in your truck from the markers.
 

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aside from mile markers, if you can get a hold of a garmin or tom tom GPS - most of them have a setting that will tell you MPH.
 

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Discussion Starter #11
alright, i have a bigger problem now than the tire size because the new tires are 30 inches. i passed someone last night and even though i knew i was only doing like 65, the speedo (1978 stock) was reading like 150 no lie. after that it has since been giving me a reading of 10 or so over. my dad says it might be the fact that its like 2 degrees outside thats causing it to run weird. any ideas?
 
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