TC unlocking in OD - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 19 (permalink) Old 06-14-2009, 04:00 AM Thread Starter
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TC unlocking in OD

So I have noticed that my torque converter does not stay locked in OD at highways speeds. I can be doing 75 then let off and my rpm immediatly drops down from 2000 to about 1500. Trans doesn't seem to be slipping at all. Need to check the fluid but it was fine about 2 months ago. TC going out? Was looking to get a valve body pretty soon.

1995 Ford F-250 7.3 (Sold)
1998 Nissan Maxima 3.0
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post #2 of 19 (permalink) Old 06-14-2009, 12:40 PM
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Re: TC unlocking in OD

Which one of your trucks do this?

03 lariat cc,4x4 7.3,DP-F5,36''MT,8"lift w/trac.bars,4"Silverline ss.exh,AFE II,Optimas,ATS housing,WW,Turbomaster,6.0 IC & tranny cooler,BTS,ISSPRO gauges,HPX,ITP RR,BRV+,Powerslots,WARN prem-hubs,coolant filter,ccv mod,08 mirrors,ARP's,mod.fuel & inj's.,Crower rods,AIH delete,AMSOIL fluids. ~waitn on the 38R~
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post #3 of 19 (permalink) Old 06-14-2009, 12:49 PM
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Re: TC unlocking in OD

Moved this to the correct section, carry on.


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post #4 of 19 (permalink) Old 06-14-2009, 02:46 PM
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Re: TC unlocking in OD

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Originally Posted by ADubDiesel View Post
So I have noticed that my torque converter does not stay locked in OD at highways speeds. I can be doing 75 then let off and my rpm immediatly drops down from 2000 to about 1500. Trans doesn't seem to be slipping at all. Need to check the fluid but it was fine about 2 months ago. TC going out? Was looking to get a valve body pretty soon.
That's normal. When you let off of the go pedal the torque converter is supposed to unlock.
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post #5 of 19 (permalink) Old 06-14-2009, 09:06 PM Thread Starter
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Re: TC unlocking in OD

It's on the 95 so an E4OD. I thought in overdrive the torque converter was supposed to stay locked?

1995 Ford F-250 7.3 (Sold)
1998 Nissan Maxima 3.0
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post #6 of 19 (permalink) Old 06-14-2009, 10:18 PM
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Re: TC unlocking in OD

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Originally Posted by Mark Kovalsky View Post
That's normal. When you let off of the go pedal the torque converter is supposed to unlock.
You sure about that? I use mine on the highway to slow the truck down in the hills
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post #7 of 19 (permalink) Old 06-14-2009, 11:00 PM
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Re: TC unlocking in OD

Mine does that... Like if I'm going 70 and I let off with my manual tc switch engaged... I think it's GOTTA be normal.
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post #8 of 19 (permalink) Old 06-15-2009, 10:44 AM
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Re: TC unlocking in OD

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Originally Posted by Austinj427 View Post
You sure about that? I use mine on the highway to slow the truck down in the hills
Yes, I'm sure. You don't need the torque converter locked to use the engine to slow the truck.
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post #9 of 19 (permalink) Old 06-15-2009, 12:46 PM
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Re: TC unlocking in OD

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Originally Posted by ADubDiesel View Post
It's on the 95 so an E4OD. I thought in overdrive the torque converter was supposed to stay locked?
You probably noticed this on the 95 as opposed to the 01 in your signature after driving each one.

Yes, the 95 will do that if it's still got stock programming. Your 01 will likely (depending on PCM code) leave the TC locked on decel down to 30 MPH. It will stay locked through the 4-3 downshift at 40 MPH...even if you hit the brakes.

The best you'll ever get for your 95 will be a TC clutch that stays locked at 0% APP (accelerator pedal position) on decel but will unlock as soon as you hit the brake pedal.

Cody
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post #10 of 19 (permalink) Old 06-15-2009, 04:32 PM
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Re: TC unlocking in OD

I'm gonna have to take a video....
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