speedo question from stock to 36's - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 03-05-2010, 09:52 PM Thread Starter
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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

Black harley lts w/5k hids , blacked out tail lights w/leds,front & rear maghytec diff covers filled w/amsoil, 3" level kit w/ 3" rear block and 5100 bilsteins. 20" novakanes on 35 toyo mt's. kenwood touch screen w/amped kenwood door speakers w/ jl 10w3 subs, optima batts,ipr egr delete,5" sinister stainless exhaust,livewire ts w/egt probe,roof rack removed,mac air intake, blue spring mod, sinister clnt filter,clnt flush & filled w/elc

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post #2 of 6 Old 03-05-2010, 11:08 PM
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Bigger tires means you are going faster than what your speedo reads.

00 F350XL 7.3 RCLB ZF6 4x4
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post #3 of 6 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.


"Late" 99 F250
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post #4 of 6 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

2012 F350

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post #5 of 6 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

05+ coils, 10 Rear diff, box, tailgate, lights, bumper, Full 07 front harley swap...the list is endless.

AS IM RARLEY on here anymore...have a question ?? EMAIL ME dakinbryce@hotmail.com..ill gladly answer any of your questions. OR search me on facebook. ill help out anyway I can !

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post #6 of 6 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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