5th Gear Lockout - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 12 Old 07-13-2012, 05:41 PM Thread Starter
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5th Gear Lockout

Hello,

I'm a bit of a Newbie so not sure this post is in the right section. I have a 2005 F250 4x4 6.0L Auto and love the truck so far. My only complaint is when towing in hilly terrain it constantly hops between 5th and 4th gear in Tow/Haul mode (trailer is about 9000lbs with a large frontal area). In this terrain I would prefer to just have it stay in 4th.

Is there any way to lockout 5th gear so the transmission stays in 4th (1:1) or even 3rd overdrive (1.10:1)?? The gear selector only gives you the option of 3rd or OD.

I would love to somehow have this lockout hooked to one of the upfitter switces.

Any help is appreciated!

Thanks.
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post #2 of 12 Old 07-13-2012, 06:46 PM
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if your run a sct im sure you could have a tow tune written to not going into 6 gear until say 75 or higher btw the shift pattern is 1-2-3-5-6 doesnt use 4 unless below 0 f

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post #3 of 12 Old 07-13-2012, 08:40 PM Thread Starter
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Thanks, maybe it's time I contact SCT. I was hoping for something a little more manually operated like a switch on the dash but maybe it's not possible.

I always thought the shift pattern was 1-2-3-4-5 with 3rd+OD (1.10:1) being the "hidden ratio" used instead of 4th (1:1) in cold ambient temps.

Cheers.
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post #4 of 12 Old 07-13-2012, 08:50 PM
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The only way you are going to be able to hold effective 4th gear, is to have a tow file written not to see a 5th.

Here's my question though, what RPM's and Boost levels are you seeing, and how much are you pulling that make you want to eliminate 5th gear?
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post #5 of 12 Old 07-13-2012, 10:21 PM
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So that everyone can follow this please use the correct gearing which is 12356 without a 4th gear. If you hold in 5th gear you can easily still run at speeds of 70mph. Your fuel mileage will take a hit but that's to be expected. Have an SCT tow tune written that holds off 6th gear shift to 80mph and you're good to go.
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post #6 of 12 Old 07-13-2012, 10:53 PM Thread Starter
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Colo_Dually: if I recall correctly I'm seeing around 10psi boost at about 1800-1900 RPM pulling a travel trailer that is approx 9000lbs. It chugs along the flats just fine in OD but once into the rolling hills (especially with a headwind) it keeps downshifting. When in the rolling stuff I'd like it to just stay out of overdrive.

PGreenSVT: Point taken, I will stick with 1-2-3-5-6 and call it "5th" gear that I would like to hold and "6th" that I would like to lock out.

Cheers!
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post #7 of 12 Old 07-15-2012, 03:00 PM
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I haul a big truck camper and pull a boat (about 9 to 10,000 lbs) and my truck used to shift in and out of OD all the time. I am now running IDP's tow tune through my SCT and it is night and day difference. I just returned from a trip from WV. to Scranton, Pa. and there where only a hand full of hills that required the truck to shift out of OD. I am stock other than EGR delete and the Tuner.

2012 F450 KR 4'' rear blocks
Gone 2005 F350 King Ranch, EGR delete, ARP studs, Dually conversion,Firestone Air bags
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post #8 of 12 Old 07-15-2012, 04:21 PM Thread Starter
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wewbfine: Thanks for the reply, excuse my ignorance but what is IDP? That tow tune sounds great, but I am not studded and worry about possible side effects on my headgaskets. I do have an EGR delete installed.

Cheers.
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post #9 of 12 Old 07-15-2012, 04:23 PM
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IDP = Innovative Diesel Performance.

I also run their Tow file, and I have zero issues with the transmission hunting for the right gear.
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post #10 of 12 Old 07-15-2012, 04:34 PM Thread Starter
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Is that something that would be safe to run without studs?
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