4r100 transmission quit shifting - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 01-05-2012, 11:58 PM Thread Starter
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4r100 transmission quit shifting

i own a 1999 f350 dually with 7.3 turbo diesel with a 4r100 tranny with od.my problem is that the tranny quit shifting all together.it had been working fine it just quit pulling one night.i took off from redlight it shifted1-2-3 and quit before 4 motor just revved up.when coasting to stop i manually downshifted to 2 nothing to1 it grabbed for a second then nothing.it was full of good red fliud and has not moved since.i hooked a matco determinator scanner to it and said no tcc operation.i datastreamed the tranny and the solenoids were operating(opening and closing)on command of the shifter.any suggestions?dont really want to take to transmission shop unless i have to.
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post #2 of 6 Old 01-06-2012, 12:08 AM
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Any debris in the oil pan? Or maybe pump gave up on ya?


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post #3 of 6 Old 01-06-2012, 02:22 AM Thread Starter
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just normal wear fine shavings(powder)on magnet.replaced solenoid pack now od light flashes in park,neutral and reverse.light does not flash in drive,1-2.scanner still saying no tcc operation.could it possibly be that the pcm needs to be replaced?
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post #4 of 6 Old 01-06-2012, 02:49 AM Thread Starter
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Originally Posted by nccatfan View Post
Any debris in the oil pan? Or maybe pump gave up on ya?
no just normal fine powder on magnet.replaced solenoid pack now od light flashes in p-r-n does not flash in d-2-1 .could the pcm be faulty and need to be replaced?if reply has been sent allready sorry!new to site and not sure if it was sent..
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post #5 of 6 Old 01-07-2013, 02:39 AM
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Did you ever figure out what the issue was, have a slimier issue. Parked the truck over night and woke up to no gears what so ever.
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post #6 of 6 Old 01-14-2013, 09:51 AM
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Originally Posted by StrokeThis 7.3 View Post
Did you ever figure out what the issue was, have a slimier issue. Parked the truck over night and woke up to no gears what so ever.
StrokeThis, I had the same problem with my tranny & recently just took it apart. It turns out I had blown the coaster bearing in the trans assembly & my coaster drum's lip seal had been damaged from original assembly from the factory. If you know how to work on transmissions, see if you have any trans. DTCs. I don't remember the DTC numbers, but the 2 I had were: Gear 3 incorrect ratio, & Error 2-3 shift.

When I dropped my pan, I found fragments of the race & ball bearings from the coaster bearing & a bunch of junk stuck to the magnet. I'm being told this is a common problem for the 4R100 whether it's being used for street/strip or excessive towing with stock internals of the trans.

Don't let the appearance of the ATF on the dipstick fool you. Mine appeared clean & up to the level it should've been, but when I dropped the pan it was almost purple & smelled cooked.

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