Speedocalibration and tire clearance - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 04-20-2017, 08:30 PM Thread Starter
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Speedocalibration and tire clearance

Okay I'm like pretty new to the powerstroke forum so if these both have been covered my apologies I can't figure out how to "search" using the TapTalk app... anyways I bought a 2012 F-250 recently it already has a H&S single tune on the truck well I want to throw a set of 37 mud grapplers on the truck but I want my speedo to be pretty accurate. I saw somewhere somebody saying you can't use the Hypertech speedo calibrator with a tune. My truck is tuned and deleted by previous owner. I also have a question about tire clearance I want to jump from the stock 275/65r20s to a 37x13.50r20 mud grappler I have a 2.5" lift but I'm more concerned about clearance on my radius arms. I'm going to be running the stock 20" lariat wheels and I want to know other than buying a new set of wheels with offset what my next option would be??


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post #2 of 5 Old 04-21-2017, 03:05 AM
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One thing is for sure, don't run the 13.5" wides on 8" wide OEM wheels. You are just asking for more problems. For the radius arm rubbing you have options to use aftermarket arms.

There is a small amount of speedo adjustment that can be made in the PCM but might not be enough to get you "accurate". I'd ask around to those who can write you a tune for the H&S.


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post #3 of 5 Old 04-21-2017, 05:46 AM Thread Starter
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Originally Posted by HeavyAssault View Post
One thing is for sure, don't run the 13.5" wides on 8" wide OEM wheels. You are just asking for more problems. For the radius arm rubbing you have options to use aftermarket arms.

There is a small amount of speedo adjustment that can be made in the PCM but might not be enough to get you "accurate". I'd ask around to those who can write you a tune for the H&S.


Don't have the H&S tuner just had a single tune flashed into the truck and returned the tuner to the company. I'm really not wanting to run much offset I've seen people run the 8" wheels with 13.5" and I'm trying to get more input on what my other options are on radius arm rubbing.


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post #4 of 5 Old 04-21-2017, 05:47 AM Thread Starter
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Originally Posted by HeavyAssault View Post
One thing is for sure, don't run the 13.5" wides on 8" wide OEM wheels. You are just asking for more problems. For the radius arm rubbing you have options to use aftermarket arms.

There is a small amount of speedo adjustment that can be made in the PCM but might not be enough to get you "accurate". I'd ask around to those who can write you a tune for the H&S.


Also looking for input on the hypertech speedo calibrator


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post #5 of 5 Old 04-21-2017, 01:57 PM
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Carli arms or OUO ALAs for the aftermarket arms.


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