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Old 12-05-2007, 06:46 PM
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Question speedo

my speedo is reeding 70mph my actual speed is 65. not it is this way all the way through. so at 40 i am going 35. can this be change ny programming of do i have to change out the gear?




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Old 12-05-2007, 07:03 PM
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Quote:
Originally Posted by firefooll View Post
my speedo is reeding 70mph my actual speed is 65. not it is this way all the way through. so at 40 i am going 35. can this be change ny programming of do i have to change out the gear?




do you have larger tires or a diff set of gears than stock? this can be done with programming... or a modual like the super lift true speed....
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Old 12-05-2007, 07:10 PM
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just bought it i will check on it Friday its in the shop. odds & ends at the dealership

Cost 1 arm 4 toes of 1 kidney LOL:
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Old 12-06-2007, 03:44 AM
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My speedo was off three miles an hour with 265's when I bought it put 285's on and it is back to normal.
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Old 12-08-2007, 03:49 AM
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If it's a difference due to smaller tires. The speed at 40 would be proportionate not a direct subtraction. So if you are really traveling at 65 and it reads 70, when reading 40 you should be traveling 37. You are traveling about 93% slower than your speedo is reading. 65 is 93% of 70 just as 37 is 93% of 40.
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Old 12-08-2007, 04:09 AM
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Well mine read three miles off at any speed and when I put on new tires it is correct now I have a garmin so i can check my speed while driving.
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Old 12-09-2007, 09:14 AM
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that's ineresting. I have no idea then. The only experience I have with that is on my 94 f150 I read 65 when I am going 75 because of the 35"x12.50" 15"'s that I have on it and the difference is less the slower I go. Maybe the speedo sender is in a different spot. On the 94 its a magnet that reads a sproket in the rear end. I have no idea where the speedo sender is on psd's
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