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Old 03-05-2010, 09:52 PM
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speedo question from stock to 36's

Alright just got a 4" lift on the truck and im wondering if my speedo is now slow or fast? Ive done it on 3 sights 2 said it would read faster and the other said slower.

Went from stock 265/75/16 to 36x13/16

2 showed when going 45 it would actually be 50
the other when going 45 would be 40

Any ideas?

Thanks
Mike
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Old 03-05-2010, 11:08 PM
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Bigger tires means you are going faster than what your speedo reads.
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Old 03-09-2010, 09:24 AM
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agreed.

My speedo reads 60mph but I am actually going 66mph.

I have 35s.
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Old 03-10-2010, 05:25 PM
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yes, it'll read slower than actual speed.

just go to your local Ford dealer and have them calibrate it for you. I've had it done twice now. Was around $50 i believe
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Old 03-10-2010, 05:33 PM
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or jsut drive beside someone with a totally stock vehicle and figure out how bad over you are and just account for it..easy peasy
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Old 03-10-2010, 05:54 PM
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Or use a gps. Thats what I do with 35's but mine is pretty accurate till about 65 then its only off a little. 75 is only like 79 for me
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