05 PSD use only 1-4th gear sct. - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 27 Old 02-21-2011, 10:53 AM Thread Starter
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05 PSD use only 1-4th gear sct.

i have an 05 PSD and I got bigger tires for it and now it lugs in 5th gear. How can I program it with my SCT where it only shifts gears 1-4. Basically I dont want it to go into 5th gear. When I am goin 70 mph, its like 1400 rpm and I have to floor it to up hill. I really appricate the help thank you.
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post #2 of 27 Old 02-21-2011, 10:58 AM
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you need a regear

you can change the shift points but I dont think you can tell it to not even use a gear.... your tuner should be able to help you.
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post #3 of 27 Old 02-21-2011, 11:07 AM Thread Starter
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how do i change the shift points on the sct? Im sure if I set the shift point from 4 to 5th like at 4000 rpm, it shouldn't shift to 5th.
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post #4 of 27 Old 02-21-2011, 11:08 AM
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Another option is to use the tow haul. The better option is to re-gear if you do not want to get a smaller tire size.
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post #5 of 27 Old 02-21-2011, 11:09 AM
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I think the only way to keep it from shifting into 5th would be to raise the 4-5 shift point to something like 5k rpm.

But the SMART thing to do would be to re-gear for your tire size. Your transmission will thank you.

Out of curiosity, what size tires are you running now?
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post #6 of 27 Old 02-21-2011, 11:12 AM Thread Starter
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I went from a 30.5" tire to a 35". how do i change the shift point on the sct? I would love to regear but my wallet doesn't lol.
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post #7 of 27 Old 02-21-2011, 11:16 AM
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Ben, with 35" tires you shouldn't even have to worry about staying out of 5th gear. Ford offered 6.0's with almost 34" tires (275/65/20) from the factory. You have 3.73 gears, right?

What SCT tune are you running?

Last edited by Snake; 02-21-2011 at 11:24 AM.
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post #8 of 27 Old 02-21-2011, 11:23 AM Thread Starter
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yes, but my truck dies going up hill and IM IN TEXAS TOO! lol no big hills here!.. And my fuel mileage dropped from 20.2mpg (hand Calc)to 15.0 as soon as i put those tires and rims on. I looked it up, and its actually a 34.4" The Stock 2011 wheels and tires. Could there be a correlation of some sort? They are not much wider then I originally had so their should be much more air resistance.
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post #9 of 27 Old 02-21-2011, 11:26 AM
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my truck pulls 5th no problem.... 38" toyos and stock tuned....

Even when towing, i roll into the throttle and she carries just fine, w/out having EGT issues...

why your having problems. 1400rpm and my 6.0 pulls fine. Although my EGR has been disabled. Maybe your EGR system is still present?

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post #10 of 27 Old 02-21-2011, 11:28 AM
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I'm in the Hill Country and tow a gooseneck with backhoes and skid steers. I have 35x12.5x20 tires and I have plenty of power...and that was BEFORE I got my studs, egr delete and SCT. Haven't towed with the new mods yet but it should be a walk in the park compared to stock. I have 3.73 gears.


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