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#2415373 - 12/08/17 04:28 PM Re: Transmission dead? [Re: Transman]
demigh0d Offline
member

Registered: 04/19/12
Posts: 14
Loc: California
It's AWD.

Originally Posted By Transman
Is this a 4 wheel drive vehicle. Make sure nothing happened to the transfer case. Have someone start the vehicle up and place in drive and listen and feel the transfer case if equipped. The grinding could be a converter if it took out the turbine splines but that is not common on those units.

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#2415397 - 12/08/17 05:32 PM Re: Transmission dead? [Re: demigh0d]
demigh0d Offline
member

Registered: 04/19/12
Posts: 14
Loc: California
No metal in the pan that I can see.

Filters were tight. Nothing out of the ordinary.

Looks like this is the first time the pan has been off as there was no gasket, just rtv.

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#2415486 - 12/08/17 08:11 PM Re: Transmission dead? [Re: demigh0d]
Transman Offline
mopar

Registered: 03/27/11
Posts: 552
Loc: Michigan
Look on the side of the valve body - there should be a long metal "strap" that holds the accumulator pistons in place - these sometimes pull the screws out and cause a gigantic leak.

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#2415855 - 12/09/17 04:38 PM Re: Transmission dead? [Re: Transman]
demigh0d Offline
member

Registered: 04/19/12
Posts: 14
Loc: California
I dropped the valve body.

Those bolts are all tight.

Originally Posted By Transman
Look on the side of the valve body - there should be a long metal "strap" that holds the accumulator pistons in place - these sometimes pull the screws out and cause a gigantic leak.

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#2415858 - 12/09/17 04:42 PM Re: Transmission dead? [Re: Tom_440]
demigh0d Offline
member

Registered: 04/19/12
Posts: 14
Loc: California
No, No codes.

Originally Posted By Tom_440
Originally Posted By stumpy
Isn't there a valve in one of the cooler lines that can cause trouble Or is that another truck model?


The valve in the cooler line can get gummed up and keep the trans fluid from circulating, cooking the trans. Doesn't seem the fluid is burned here.

Throw any codes?

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#2415920 - 12/09/17 07:05 PM Re: Transmission dead? [Re: demigh0d]
Transman Offline
mopar

Registered: 03/27/11
Posts: 552
Loc: Michigan
Get it off the ground - start it up and out in gear and feel/listen to the transfer unit - can't remember the last time I saw an RFE unit act like yours and not set a code. Sounds like something else gave up he ghost.

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#2416334 - 12/10/17 02:56 PM Re: Transmission dead? [Re: Transman]
demigh0d Offline
member

Registered: 04/19/12
Posts: 14
Loc: California
My mistake, there actually are codes....

P0750 Shift Solenoid 'A'
P0700 Trans Control System

I don't know why they didn't show up the first time.

Originally Posted By Transman
Get it off the ground - start it up and out in gear and feel/listen to the transfer unit - can't remember the last time I saw an RFE unit act like yours and not set a code. Sounds like something else gave up he ghost.

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#2416652 - 12/11/17 01:42 AM Re: Transmission dead? [Re: Transman]
383man Offline
Too Many Posts

Registered: 01/19/03
Posts: 26564
Loc: Balt. Md
Originally Posted By Transman
Look on the side of the valve body - there should be a long metal "strap" that holds the accumulator pistons in place - these sometimes pull the screws out and cause a gigantic leak.



Saw that a good bit at the dealer. I had one loose line pressure on one when the plate screws came loose and the plate let an accumlator piston fall out. Ron
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#2416741 - 12/11/17 10:38 AM Re: Transmission dead? [Re: demigh0d]
demigh0d Offline
member

Registered: 04/19/12
Posts: 14
Loc: California
So, based on responses and what I've read, I've ordered a remanufactured solenoid pack. I figure if it doesn't fix the problem I'm only out $150.

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#2416748 - 12/11/17 10:52 AM Re: Transmission dead? [Re: demigh0d]
Transman Offline
mopar

Registered: 03/27/11
Posts: 552
Loc: Michigan
I doubt anyone could blame a solenoid pack in regards to grinding on engine shutoff.

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#2416749 - 12/11/17 10:54 AM Re: Transmission dead? [Re: demigh0d]
Transman Offline
mopar

Registered: 03/27/11
Posts: 552
Loc: Michigan
I doubt anyone could blame a solenoid pack in regards to grinding on engine shutoff.
They do make noise sometimes on initial engagement but I doubt you would hear a RFE since it's in the pan. The 41TE used to cause a noise like dragging your finger across the teeth of a comb but that solenoid module was external.

I don't see where you checked for cooler flow to see if the pump is working properly.
I don't see where you checked to see if the drivetrain is ok - an AWD has a module that can fail and cause a no-drive condition.
If there is no cooler flow and no line pressure you need to drop the trans and check the regulator and tc control valves.


Edited by Transman (12/11/17 10:59 AM)

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#2416777 - 12/11/17 11:53 AM Re: Transmission dead? [Re: Transman]
demigh0d Offline
member

Registered: 04/19/12
Posts: 14
Loc: California
Well it's not really grinding. That's just the closest description I could come up with at the time.

Since then I recorded it and have been able to listen to it multiple times.

It's probably closer to the sound when you put the trans into park while still rolling. Though not as loud.

Originally Posted By Transman
like dragging your finger across the teeth of a comb


That actually descibes the sound pretty well.

Originally Posted By Transman
I doubt anyone could blame a solenoid pack in regards to grinding on engine shutoff.


Edited by demigh0d (12/11/17 11:57 AM)

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#2416798 - 12/11/17 12:54 PM Re: Transmission dead? [Re: Transman]
demigh0d Offline
member

Registered: 04/19/12
Posts: 14
Loc: California
From what I understand there's usually warning signs that a pump is failing (MIL code, overheating, poor shifting, noise). They aren't known to fail suddenly like this.

The trans functioned perfectly up until the moment this happened.

I was heading up a (aprox) 15% grade approaching a sharp corner. Probably doing 10-15mph. No noise, no warning. It was like I had shifted it into neutral.

Thought: If the trans attempted to shift into 1st (Slowing for the corner) and the LR solenoid didn't actuate could it cause the same symptom?

A faulty tc control valve won't produce my symptoms. If stuck closed it'll affect gas milage and cause overheating. Stuck open will cause the engine to stall when coming to a stop. It should also generate a MIL code.

The drivetrain appears to be ok.

I'm trying to avoid dropping the trans if possible. I'm pushing 60 so working on cars isn't as easy as it used to be. Working in a driveway of 3/4" drain rock doesn't help either.

I also need to get it back on the road quickly.

I figure it's worth gambling $150 on a solenoid pack. I already have it apart. If that doesn't take care or it the next step will be to drop the trans.

With it out I might as well do a complete rebuild. I've rebuilt 727s and these look (from the tear down videos I've watched) a lot simpler.

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#2416873 - 12/11/17 03:06 PM Re: Transmission dead? [Re: demigh0d]
Transman Offline
mopar

Registered: 03/27/11
Posts: 552
Loc: Michigan
Unless I forgot something the tc valve controls converter fill - if the converter doesn't fill you get no drive and noise. But we can't always explain all symptoms without data.

As for the solenoid - generally if you put it in relay limp in you should get something regarding movement.

I hope your solenoid pack get some you back on he road.

And for pumps - one piece of debris from the converter can lodge the PRV open - or any other valve for that matter.

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