Gearing and SCT question - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 10-23-2007, 12:31 PM Thread Starter
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Gearing and SCT question

Trying to gain some knowledge. Did a search couldn't find anything. If I added 37" tires....of course with a 6" lift...would I need to re gear. Would be an 06 F250 SD...so obviously 3.73 gears. Also....will the Livewire recalibrate the speedo for me or no? I want my actual dash speedometer to be correct, I don't want to refer to a module for my correct speed.

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post #2 of 7 Old 10-23-2007, 02:02 PM
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As far as re-gearing you do not have to but you would need to. The Livewire will not re-calibrate your indash speedo. I am sure there will be others along shortly who will also chime in with their opinions. I hope this helps.

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post #3 of 7 Old 10-23-2007, 02:12 PM Thread Starter
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What would be the best gears to re gear to? and how do I go about recalibrating my in dash speedo then?
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post #4 of 7 Old 10-23-2007, 02:16 PM
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I am being told probably 4.30s. As far as your speedo, the dealership may be able to re-calibrate it to a certain point. You can also get a Truspeed. It is a electronic device to recalibrate your speedo.

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04 F250 CC 6.0L PSD 2WD
A Few Ponies Under The Hood
Wrenches Turned by Trucks Unlimited (Thanks Scott!) and NPCCPARTSMAN
Injectors by Ryan Casserly of Full Force Diesel

Turbo by KC
Oil Cooler by BulletProof Diesel
SCT Custom Tuning


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post #5 of 7 Old 10-23-2007, 04:48 PM
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I just put 4.30 gears in my beast, 100% difference towing my fifthwheel in the mountains. I have 33'' mickey thompson atz's and I am running 2200 RPM's at 65mph, so I would think 4.30's would be perfect with 37'' tires. My truck pulls harder and faster up steep grades without my tow tune due to the gears. ( should have been my first mod) The dealership can do your speedo for 100 bucks. I also gained some fuel mileage pulling my fifthwheel.
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post #6 of 7 Old 10-23-2007, 05:07 PM Thread Starter
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Well I will be doing pretty much NO towing...like maybe twice a year tops. So I was thinking maybe 4.10's instead for highway mileage and all.
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post #7 of 7 Old 10-24-2007, 05:21 PM Thread Starter
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Any other opinions on 4.30 or 4.10??
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