4R100 issues

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Nov 7, 2018 | 06:34 PM

OlBlue7.3

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From: Clifton Arizona

4R100 issues

Hello all,

I’m new to this forum so please forgive me if I’m posting in the wrong area. I’m having some issues with the 4r100 transmission in my ‘03 F250 7.3 4x4. It happened out of the blue. I will be driving at approximately 45-50 mph (overdrive on) and it will act like it’s going down a gear, then back up like it’s not sure what gear to be in. If I lay into the throttle it will drop shift normally, I’ve also noticed that if I go lead a dead stop the RPMs will go up to about 1200 then the transmission will softly go into gear. I dropped the pan and the oil was dirty, with a metallic color but not as bad as I have seen some. I changed the fluid/filter and it continues to do it. Also, it only does it after the trans is warm and the O/D light does not flash. I just need some opinions, torque converter going out? Clutches slipping, solenoid .... etc truck has about 202500 on it and transmission was rebuilt by P/O approx two years ago. Thanks so much!

Nov 7, 2018 | 07:29 PM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

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From: SE Florida

How much fluid did you change? The complete system holds about 18 quarts. If you only changed what's in the pan you need to change the fluid the correct way. Here's how: https://www.ford-trucks.com/articles...-transmission/

Nov 7, 2018 | 08:49 PM

burnthelight88

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Joined: Mar 2015

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From: Pittsburgh

Had this issue many years ago. Can't remember exactly what went because auto transmissions are my weakness, but it ended in a full rebuild. Good luck.

Nov 7, 2018 | 10:10 PM

OlBlue7.3

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From: Clifton Arizona

Quote:

Originally Posted by Mark Kovalsky

i just changed what was in the pan, more so wanting to see if there was any debris in it. I’ll give that a shot this weekend, but do you think doing a full oil change will correct this issue?

Nov 7, 2018 | 10:11 PM

OlBlue7.3

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From: Clifton Arizona

Quote:

Originally Posted by burnthelight88

Had this issue many years ago. Can't remember exactly what went because auto transmissions are my weakness, but it ended in a full rebuild. Good luck.

Dang, yeah I figured when I bought the truck and saw all the paper work for the recent transmission rebuild that I would be set. But who knows how the previous owner drove it. Thanks!

Nov 8, 2018 | 06:48 AM

Colorado350

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From: Colorado Springs

Quote:

Originally Posted by OlBlue7.3

Dang, yeah I figured when I bought the truck and saw all the paper work for the recent transmission rebuild that I would be set. But who knows how the previous owner drove it. Thanks!

I bought my truck was new rebuilt transmission, I rebuilt it 10 months later. They bought a rebuilt transmission but did not replace the TC, it went hauling 7000K over Wilkerson Pass, Colorado. I nursed it home. Luckily my newly installed 6.0 cooler was saved by the Magnefine filter I installed on the hot line before the cooler. It was packed full of metal mush. $3800 later, I did it right with a triple disc TC and HD Tugger Kit.