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, 08:22 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, 08:36 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, 09:12 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, 09:39 AM
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Yes they did then

Email: Dave@powerstroke.org
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

Leveling kit, 315/70/17 Kelly TSRs on Method race wheels
ARP studs and OEM gaskets done by Renegade Diesel
ECM and Atlas 40 FICM tuned by Bill at PHP SCT tunes by Truck Source Diesel. Gearhead, Innovative, Wildman and Tyrant diesel
Flowmaster/MBRP Hybrid Exhaust
Edge Insight CTS
Coolant filter
Bulletproof diesel FICM EGR Delete, Oil Cooler and Water Pump, and Light bar.
Dually LED lights from Stealth Automotive/Xpedition Outfitters
No Limit Fab 6.0 Cold Air Intake
http://www.bulletproofdiesel.com/default.asp
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post #5 of 25 Old 06-17-2010, 09:54 AM Thread Starter
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ok cool thanks.

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post #6 of 25 Old 06-17-2010, 10:27 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, 03:16 PM
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find someone nearby that has AE and just reprogram your speedo...

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post #8 of 25 Old 06-22-2010, 08:06 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, 03:19 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, 08:51 PM Thread Starter
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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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