456 with 38's and im still off by 10???? - Ford Powerstroke Diesel Forum
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post #1 of 25 Old 06-17-2010, 09:22 AM Thread Starter
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456 with 38's and im still off by 10????

i have 456 gears with 38 inch tires and my speedo is still off by roughly 10? dosent seem right what do you guys think? also i have a dp-tuner at the house ready to install but im worried that the truck won't act right as far as shift points and power with the tuner installed??????

Do i need truspeed or get it programmmed for the tuner to work properly?

thanks guys

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post #2 of 25 Old 06-17-2010, 09:36 AM
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Did you tell Jody you were running 4.56 gears and 38's when he wrote the tunes?

If so you will be fine.

But yes you will need a truspeed either way to make the speedo accurate

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post #3 of 25 Old 06-17-2010, 10:12 AM Thread Starter
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well its in my profile on the dp-tuner website. and when they sent me the tune it says in the peice of paper 456 gears with 38's and 4 inch exhaust and air intake. so i guess they tuned for the gears and tires then?

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post #4 of 25 Old 06-17-2010, 10:39 AM
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Yes they did then

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2011 F150 Ecoboost Crew cab lariat. Custom tunes from KEM and 5Star, and Unleashed
2012 F150 Crew Cab Ecoboost stock for now-Totaled March 12 2015
2006 F250 ECSB Lariat 4x4

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ECM and Atlas 40 FICM tuned by Bill at PHP SCT tunes by Truck Source Diesel. Gearhead, Innovative, Wildman and Tyrant diesel
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Dually LED lights from Stealth Automotive/Xpedition Outfitters
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post #5 of 25 Old 06-17-2010, 10:54 AM Thread Starter
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ok cool thanks.

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post #6 of 25 Old 06-17-2010, 11:27 AM
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I have a truspeed recal brand new in box. Let me know if you need it.

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post #7 of 25 Old 06-17-2010, 04:16 PM
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find someone nearby that has AE and just reprogram your speedo...

2001 - 14" OUO 525 - 38x15.5x20 Toyo & 20x12 Weld Cheyenne's. Hybrids, 38R, BTS, Spearco, Terminators..


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You will get some axle wrap with a heavy trailer, I can feel it when towing my gooseneck with some heavy equipment. My Deavers will wrap enough to make the tires rub the front of the rear fender well if I give it too much throttle on aceleration.
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post #8 of 25 Old 06-22-2010, 09:06 PM
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I have a truspeed recal brand new in box. Let me know if you need it.

How much do you want for it??



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post #9 of 25 Old 07-06-2010, 04:19 PM
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hey parkesj,

what rpm's are you running at about 60mph in your truck with those gears? I have 5.13's in mine and they are just to low of a gear, fun off the line and off-road, but my overdrive is pretty much not there.. oh and I was only 5mph off with my gears then i got the truespeed and and its dead on now.


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post #10 of 25 Old 07-11-2010, 09:51 PM Thread Starter
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Quote:
Originally Posted by strokin'patty View Post
hey parkesj,

what rpm's are you running at about 60mph in your truck with those gears? I have 5.13's in mine and they are just to low of a gear, fun off the line and off-road, but my overdrive is pretty much not there.. oh and I was only 5mph off with my gears then i got the truespeed and and its dead on now.
i think 60mph is about right at 2k, but like i said im 10 off or so, so i could be a little wrong. but roughly about 2k. does that seem right?

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