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Old 06-11-2018, 08:05 PM   #1
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New Member with a Crazy 545RFE

Hi folks,

My name is Pete. I live just outside beautiful Denver Colorado, and I have a 2011 ram 2500 5.7 4x4 SLT that has apparently lost it's mind.

I rebuilt the engine and transmission over the last few months. The engine runs great, no engine codes at all.

I wish I could say the same for the trans. This is the 3rd 3/4T auto I've rebuilt over the last few years, and I'm stumped. I replaced all clutches, seals, etc inside the trans, installed new OSS, ISS, line pressure sensor, solenoid pack, of course filters too. I took it out for a test drive around my neighborhood, and everything seemed fine. I shifted up to 3rd in auto mode, and manual mode seemed to work like it should. I took it out on a longer faster drive, and I think I never got out of 3rd. I took it on an small highway, and it was definitely not shifting right. I was turning 2500 rpm at 55 mph. I don't know if that was 3rd or 4th, but it certainly ain't right.

Now I have only 1st gear, I have gear ratio codes and hydraulic codes.

Is it possible the PCM has died / is dying? I probably have to take it to a dealer to be sure about that, I'm guessing. Why else would the manual shift feature stop working? Really odd behavior.

I'm pulling the valve body to have a look tonight, and do my air checks again.

Any other suggestions / ideas?

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Old 06-11-2018, 09:31 PM   #2
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Welcome to the forum. There are some 545 gurus here that can help. Did you do a relearn after the trans rebuild?
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Old 06-11-2018, 09:45 PM   #3
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I forgot to mention, I have AE with the Chrysler package. Yes I did a learn right after the solenoid pack. My original solenoid pack had a grey connector. I put it back in after the rebuild, because it bench checked fine, but in D, it wouldn’t let line pressure go over 40 psi or so, so I changed it out for a new white connector one, and now my desired and actual follow each other.
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Old 06-11-2018, 10:27 PM   #4
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So the trans is not shifting on its own correctly after a full rebuild and pretty much every single thing new.

Did you change the pistons? Not just the steels and clutches? Is the over pressure release intact the little metal thing near the screw on filter inside the trans. What are the CVI numbers your getting after the relearn?
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Old 06-11-2018, 11:17 PM   #5
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I don’t remember the CVI numbers, those are in my other computer, I’ll have to let you know on that one. I didn’t replace pistons, I resealed the accumulator pistons and clutch pistons. But yes everything new. It’s entirely possible I put one of the clutches back together wrong.
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Old 06-12-2018, 05:08 AM   #6
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That is possible and it’s also possible a molded piston is bad very common. When it was torn down what clutches were smoked and how bad?
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Old 06-12-2018, 05:55 AM   #7
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Old 06-12-2018, 07:02 AM   #8
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I don’t remember. The trans shop guy asked me that too, and I just pulled clutch plates out and tossed em in a pile. None of em were terrible, but there was one that was burnt, but I didn’t make note of which one.

So those accumulator pistons could cause a no shift? I thought they were for making the transitions smoother, but had little to do with the actual getting into whatever gear.
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Old 06-12-2018, 07:17 AM   #9
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Quote:
Originally Posted by Mrs.Studmuffin View Post
Thank you!
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Old 06-12-2018, 07:31 AM   #10
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I don't have any pre-build cvi numbers, because it was an auction buy and I rebuilt it from the beginning.
This is for a test drive actually after the rebuild, but before the new solenoid pack (I didn't take a post-solenoid-pack test)
LR cvi was 90
UD was 49

I don't have a 2nd and a 4th, but my AE has a "1st 2-3 OD clutch" and a "1st 3-4 OD clutch" which, I assume are 2nd and 4th. Those were both at 62. I'm not an AE expert, but I'm learning.
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