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Re: 518 OD not engaging [Re: BDW] #3092441
11/07/22 09:50 PM
11/07/22 09:50 PM
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Originally Posted by BDW
Factory part is long discontinued


I’ve been away from Inside Chrysler since December ‘16.

If I recall the OE for the solenoid was selling them to Sonnax. But don’t hold me to that. Rostra regularly copied our designs.

Re: 518 OD not engaging [Re: Transman] #3094418
11/15/22 03:25 PM
11/15/22 03:25 PM
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I ordered a new solenoid and removed the tranny pan.
Issue was the LU worked but OD doesn't.
Before replacing the solenoid, I wanted to try 1 more thing.
I have manual toggle switches to enable those lines (separately) to ground.
So I tried toggling both switches, with power applied, did this while under car with finger on each solenoid.
I expected to hear or feel the LU side doing something? But nothing happened for either side.
Am I missing something?

Re: 518 OD not engaging [Re: BDW] #3094421
11/15/22 03:35 PM
11/15/22 03:35 PM
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No, I've never heard or felt anything in those solenoids.


I raise chickens, so I am literally a chicken tender.

The Scamp is sold, now just two old trucks and one newer one.
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: 518 OD not engaging [Re: Guitar Jones] #3094503
11/15/22 08:59 PM
11/15/22 08:59 PM
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Appreciate the response,
So is there anything I can check before replacing this solenoid and dumping $100 worth of fluid in it?

Re: 518 OD not engaging [Re: BDW] #3094520
11/15/22 09:29 PM
11/15/22 09:29 PM
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You could clean a drain pan, clean the trans and save the fluid to reuse. Other than that, I know of nothing.


I raise chickens, so I am literally a chicken tender.

The Scamp is sold, now just two old trucks and one newer one.
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: 518 OD not engaging [Re: BDW] #3094532
11/15/22 10:26 PM
11/15/22 10:26 PM
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Originally Posted by BDW
Appreciate the response,
So is there anything I can check before replacing this solenoid and dumping $100 worth of fluid in it?


Bench test the solenoid.

Re: 518 OD not engaging [Re: Transman] #3094535
11/15/22 10:34 PM
11/15/22 10:34 PM
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Originally Posted by Transman
Originally Posted by BDW
Appreciate the response,
So is there anything I can check before replacing this solenoid and dumping $100 worth of fluid in it?


Bench test the solenoid.


How would I do that, looking at it, it doesn't seem to have a plunger.
I'm thinking the coil is energized when voltage is applied to create a magnetic field to hold something in the tranny?
No moving parts on this solenoid, that I can see.

Re: 518 OD not engaging [Re: BDW] #3094541
11/15/22 11:12 PM
11/15/22 11:12 PM
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Originally Posted by BDW
Originally Posted by Transman
Originally Posted by BDW
Appreciate the response,
So is there anything I can check before replacing this solenoid and dumping $100 worth of fluid in it?


Bench test the solenoid.


How would I do that, looking at it, it doesn't seem to have a plunger.
I'm thinking the coil is energized when voltage is applied to create a magnetic field to hold something in the tranny?
No moving parts on this solenoid, that I can see.


Check your PM

Re: 518 OD not engaging [Re: Transman] #3094807
11/16/22 07:43 PM
11/16/22 07:43 PM
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Well I guess I should have taken a closer look at the pan before I committed to replacing the solenoid.
So there's grey sludge, material on the magnet, and a couple pieces of metal.
What am I looking at, and is this the reason the OD didn't work?

[Linked Image]


[Linked Image]

[Linked Image]

Re: 518 OD not engaging [Re: BDW] #3094815
11/16/22 08:16 PM
11/16/22 08:16 PM
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With the Chia pet for a magnet, it’s time to get it apart.

Likely the OD unit is failing. Just a guess at thins point but likely one of the large needle bearing units or a planetary starting to fail.
The most common failure we saw in the Reman program was the bearing on the back of the main case - the OD thrust bearing.
And when it fails you lose the required travel to apply the OD clutch and disengage the Direct clutch.

Re: 518 OD not engaging [Re: Transman] #3094839
11/16/22 10:58 PM
11/16/22 10:58 PM
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Freeport IL USA
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Originally Posted by Transman
With the Chia pet for a magnet, it’s time to get it apart.

Likely the OD unit is failing. Just a guess at thins point but likely one of the large needle bearing units or a planetary starting to fail.
The most common failure we saw in the Reman program was the bearing on the back of the main case - the OD thrust bearing.
And when it fails you lose the required travel to apply the OD clutch and disengage the Direct clutch.



So, um... If that is what actually made the OD not function, and a guy kept driving it without the functioning OD, is it more costly to rebuild the trans then if it was pulled and rebuilt right after the OD quit working?

I blew a trans cooler line but didn't know it until ran it out of fluid and I coasted into a parking lot. I repaired the cooler line, added 8 quarts of ATF 4 (96 46RE 4x4 trans with 44K miles). The trans seemed to work OK except the OD didn't work. After nearly a year of using the trans, it doesn't seem quite right when leaving a stop light (I might be getting paranoid). Once its moving it seems OK, except the no OD. It shifts very smoothly from 2nd to 3rd.

I'm expecting to have to rebuild the trans (I'm hoping to make it to spring). I could drop the pan if you think it would be helpful, but at this point I suspect the damage is done and a fluid, filter, and maybe a few parts won't help long term. I'm probably going to run it until it fails, or spring, whichever comes 1st, unless you think a new filter and fluid will help. Should I plan on rebuilding a different trans, or is this one going to be OK to rebuild?

Re: 518 OD not engaging [Re: poorboy] #3094841
11/16/22 11:07 PM
11/16/22 11:07 PM
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Originally Posted by poorboy
Originally Posted by Transman
With the Chia pet for a magnet, it’s time to get it apart.

Likely the OD unit is failing. Just a guess at thins point but likely one of the large needle bearing units or a planetary starting to fail.
The most common failure we saw in the Reman program was the bearing on the back of the main case - the OD thrust bearing.
And when it fails you lose the required travel to apply the OD clutch and disengage the Direct clutch.



So, um... If that is what actually made the OD not function, and a guy kept driving it without the functioning OD, is it more costly to rebuild the trans then if it was pulled and rebuilt right after the OD quit working?

I blew a trans cooler line but didn't know it until ran it out of fluid and I coasted into a parking lot. I repaired the cooler line, added 8 quarts of ATF 4 (96 46RE 4x4 trans with 44K miles). The trans seemed to work OK except the OD didn't work. After nearly a year of using the trans, it doesn't seem quite right when leaving a stop light (I might be getting paranoid). Once its moving it seems OK, except the no OD. It shifts very smoothly from 2nd to 3rd.

I'm expecting to have to rebuild the trans (I'm hoping to make it to spring). I could drop the pan if you think it would be helpful, but at this point I suspect the damage is done and a fluid, filter, and maybe a few parts won't help long term. I'm probably going to run it until it fails, or spring, whichever comes 1st, unless you think a new filter and fluid will help. Should I plan on rebuilding a different trans, or is this one going to be OK to rebuild?

No telling until you get it out. Is this the same trans that had water in it? If so just yank it.


I raise chickens, so I am literally a chicken tender.

The Scamp is sold, now just two old trucks and one newer one.
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: 518 OD not engaging [Re: BDW] #3094842
11/16/22 11:13 PM
11/16/22 11:13 PM
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Originally Posted by BDW
Well I guess I should have taken a closer look at the pan before I committed to replacing the solenoid.
So there's grey sludge, material on the magnet, and a couple pieces of metal.
What am I looking at, and is this the reason the OD didn't work?

[Linked Image]


[Linked Image]

[Linked Image]

Hard to tell from the pics but those pieces appear to be friction material or maybe snap ring pieces. The gray sludge is probably aluminum from the torque converter or rear support. Time to go through it.


I raise chickens, so I am literally a chicken tender.

The Scamp is sold, now just two old trucks and one newer one.
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: 518 OD not engaging [Re: Guitar Jones] #3094847
11/16/22 11:38 PM
11/16/22 11:38 PM
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All just guesses at this point.

The snap ring is likely the wave snap ring for the OD clutch. Regardless, with the debris is needs to be gone through.

Last edited by Transman; 11/16/22 11:41 PM.
Re: 518 OD not engaging [Re: Transman] #3094867
11/17/22 05:46 AM
11/17/22 05:46 AM
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Appreciate the replies, this is really frustrating.
Paid $1k 8 years ago to have this "completely" rebuilt, as a carry in.
Only 15k miles on it since that time.

So I guess I need to pull it and carry in to someone else.
What do I tell them or ask for during the rebuild to make sure it gets done right this time?

Thx

Re: 518 OD not engaging [Re: BDW] #3094887
11/17/22 08:09 AM
11/17/22 08:09 AM
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Originally Posted by BDW
Appreciate the replies, this is really frustrating.
Paid $1k 8 years ago to have this "completely" rebuilt, as a carry in.
Only 15k miles on it since that time.

So I guess I need to pull it and carry in to someone else.
What do I tell them or ask for during the rebuild to make sure it gets done right this time?

Thx


PM sent.

Re: 518 OD not engaging [Re: Transman] #3094944
11/17/22 11:27 AM
11/17/22 11:27 AM
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If there’s pieces it’s broke. Time to come apart, think of all the sludge-pieces going thru the trans now. My guess is the OD thrust bearing

Last edited by cudaman1969; 11/17/22 11:29 AM.
Re: 518 OD not engaging [Re: Guitar Jones] #3095081
11/17/22 07:24 PM
11/17/22 07:24 PM
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Originally Posted by Guitar Jones
Originally Posted by poorboy
Originally Posted by Transman
With the Chia pet for a magnet, it’s time to get it apart.

Likely the OD unit is failing. Just a guess at thins point but likely one of the large needle bearing units or a planetary starting to fail.
The most common failure we saw in the Reman program was the bearing on the back of the main case - the OD thrust bearing.
And when it fails you lose the required travel to apply the OD clutch and disengage the Direct clutch.



So, um... If that is what actually made the OD not function, and a guy kept driving it without the functioning OD, is it more costly to rebuild the trans then if it was pulled and rebuilt right after the OD quit working?

I blew a trans cooler line but didn't know it until ran it out of fluid and I coasted into a parking lot. I repaired the cooler line, added 8 quarts of ATF 4 (96 46RE 4x4 trans with 44K miles). The trans seemed to work OK except the OD didn't work. After nearly a year of using the trans, it doesn't seem quite right when leaving a stop light (I might be getting paranoid). Once its moving it seems OK, except the no OD. It shifts very smoothly from 2nd to 3rd.

I'm expecting to have to rebuild the trans (I'm hoping to make it to spring). I could drop the pan if you think it would be helpful, but at this point I suspect the damage is done and a fluid, filter, and maybe a few parts won't help long term. I'm probably going to run it until it fails, or spring, whichever comes 1st, unless you think a new filter and fluid will help. Should I plan on rebuilding a different trans, or is this one going to be OK to rebuild?

No telling until you get it out. Is this the same trans that had water in it? If so just yank it.


Nope. The one that got the water in it got replaced, I bought a brand new 2010 Mopar trans from a guy that bought it to put into a project he didn't use, it was sitting on a shelf and still had the factory caps on it I bought it for about the same money used transmissions were going for. Got that put in the truck and sold the truck.

This one is in my 49 on the Dakota 4x4 chassis. Had 44K miles on it when the truck was built. I've driven it about 3500 miles before the Dakota radiator started leaking between the aluminum core and the plastic tank last Dec. I bought an aftermarket radiator (that fit in this truck much better). I watched for any issues for a couple weeks, but about a month later while going across town, one of the cooler hoses blew off and ran it out of fluid. I had no idea why it started slipping about a block from where I could get off the road. As soon as I opened the door I knew what was going on. There was an auto parts store right across the street from where I stopped. I was able to put the cooler line back on, and then added 8 quarts of AFT+4. The drive home seemed fine, but a couple days later I noticed the OD wasn't working on the highway. A few weeks later I noticed it seemed a bit sluggish leaving a traffic light, but seemed to up shift 2-3 (very smooth) OK, the truck spends most of its time in town, so it wasn't a big deal not having the OD, at the time. I've considered dropping the pan adjusting the bands, change the filter, and give it a look over inside, but I'm concerned about what I might find inside the pan. It would be a major issue pulling it to rebuild it right now. No hoist available, I'd be doing it on jack stands on my back. I'm not sure I can get the truck high enough to get that heavy pig out from under the truck. The hoist is suppose to be available in the spring. The only trans rebuild shop I'd begin to trust has a 2 month backlog. Thoughts or suggestions?

Re: 518 OD not engaging [Re: poorboy] #3095087
11/17/22 07:56 PM
11/17/22 07:56 PM
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Replacing the filter and adjusting the bands won't help the no O/D situation. I would do some electrical diagnosis before anything else.


I raise chickens, so I am literally a chicken tender.

The Scamp is sold, now just two old trucks and one newer one.
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: 518 OD not engaging [Re: Guitar Jones] #3095279
11/18/22 03:37 PM
11/18/22 03:37 PM
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north of coder
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other than the od unit, those transmissions are like a 727.
if it were me [and in time, it will be] i would get an ATSG service manual [ i have one for the A518 and one for the A500] and a FSM for whatever year your transmission came from. [i also have one of those]
also, get the monroe book. that has very good tricks and tips in it.
then, i would obtain a good core, [i have already obtained two] rebuild it over the winter, then install it in the spring.
if you have rebuilt a 727, you can do an A518.
this is just me speaking from my personal experience over 55+ years of playing with this brand.
i'm still stupid, and i still ask questions because i either forgot or never knew stuff in the first place.
your mileage will vary.
beer

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