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4R100 Slushbox Problem

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Old Nov 16, 2008 | 02:57 PM
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Exclamation 4R100 Slushbox Problem

Alright, interesting transmission issue. Nothing is broken to my knowledge... yet, however the shift into 3rd outside tow haul mode while lightly on the gas is VERY mushy. Almost feels like it starts to softly engage, changes its mind and lets go, then shifts in. Overdrive does not do this, only 3rd gear. Tow Haul mode makes it better, however its still there.

Can I get a B&M kit to turn the line pressure up or change any of the accumulators/ shift solenoids to make this better? Is my tranny going out?

Just had the fluid and filter changed about 5,000 miles ago.
 
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Old Nov 16, 2008 | 03:33 PM
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I thought only the 5R110W had the "TOW/HAUL" mode.??????
 
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Old Nov 16, 2008 | 03:37 PM
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I was told my truck had a 4R100, might be different? But its got itself a tow haul mode... a nifty little button on end of the shifter that says 'Tow/ Haul' and when you push it I believe it says 'O/D OFF' or something like that.
 
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Old Nov 16, 2008 | 03:39 PM
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I believe you have the 5R110W tranny.....Sorry, I called it a different number a bit ago.
 
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Old Nov 16, 2008 | 03:40 PM
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If it takes SP tranny fluid, it's the 5R - commonly called the Torque-Shift
 
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Old Nov 16, 2008 | 03:45 PM
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SP tranny fluid? All I know is it is red and Valvoline put it in lol

But could it have GM atf in it and that messing it up? How do I find out what transmission I actually have.
 
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Old Nov 16, 2008 | 03:46 PM
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You say you had the fluid changed a while back? Do you know what fluid they put in there?? IF you do have the Torque Shift and they did NOT use SP fluid, you have a BIG problem.
 
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Old Nov 16, 2008 | 03:47 PM
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Got the owners manual? Look at the dipstick...it should tell you what fluid to put in there.
 
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Old Nov 16, 2008 | 03:49 PM
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I do not have the manual, will it say SP fluid on stick? my trans pan says ford metric
 
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Old Nov 16, 2008 | 03:54 PM
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YOu can download a manual at ford.com, I have a 2005 F250 Super Duty and I have the TorqShift
 
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Old Nov 16, 2008 | 03:56 PM
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If you have straight ATF in there, I'd be taking it to Ford tomorrow and get the right stuff in there. SP is ONLY avail from Ford.
 
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Old Nov 16, 2008 | 03:57 PM
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Originally Posted by 5.4L to Freedom
SP tranny fluid? All I know is it is red and Valvoline put it in lol

But could it have GM atf in it and that messing it up? How do I find out what transmission I actually have.
If you have anything other than Mercon SP fluid in a 5R110W TorqueShift transmission, you had better get it changed immediately.
 
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Old Nov 16, 2008 | 03:59 PM
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The good old wikipedia states that in 2004 only the diesels got the 5 speed automatic. I should have the 4r100 4 speed automatic. I usually pay very close attention to my shifts (severe distrust of automatic transmissions) and have never picked up on a 5th gear in there even if its a lockup converter. However this wierd little 2-3 shift could be a 2-4 jump then a lockup converter?

I don't know though... it drives as if it has 3 speeds and a lock up converter as the 4th. But I'm not an auto trans guy so who knows?
 
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Old Nov 16, 2008 | 04:00 PM
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Originally Posted by 5.4L to Freedom
its got itself a tow haul mode.
If you have Tow/Haul mode, you have a 5R110W.
 
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Old Nov 16, 2008 | 04:01 PM
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Sorry, but for some reason I can't edit my posts - anyway-

If it has an od on/off button, it's a 4R100
 
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