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  #1  
Old 07-06-2014, 02:06 PM
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42RE Transmission Fluid Change

The gasket on my transmission has been leaking so I finally removed the pan, fluid, and changed the gasket. The old fluid was a dark red as expected on a vehicle with 155k miles. I cleaned the magnet and it had some clutch material stuck to it, not surprising. I was surprised to find that there was a curved chunk of metal about 1" long and 1/8" wide.

I was going to take a picture but my wife was cleaning and threw it in the nasty trash and I'm not digging through it.
Prior to changing the fluid/gasket, the transmission operated just fine. Does anyone have any idea where that metal might have come from? Now that I've seen it, I'm anticipating transmission failure before too long.
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Old 07-06-2014, 04:40 PM
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Re: 42RE Transmission Fluid Change

Clutch material... and that is not a good thing...
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Old 07-06-2014, 06:09 PM
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Re: 42RE Transmission Fluid Change

Clutch material is not magnetic, at least not the liner on the clutches. I heard before of round shaped pieces of metal which where found in the transmission pan, which came from a C-clip. Can you make an estimate, knowing the rounding of the metal, how large in diameter a complete C-clip could have been?
It could give an indication from where it came from. Not well known in the internals of the 42RE, but the manual could give some ideas when the size is known.
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Old 07-06-2014, 06:21 PM
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Re: 42RE Transmission Fluid Change

I would have to estimate a 4-6 inch diameter.

The material on the magnet looked like a grey paste. I assumed it was clutch material. I guess I'll run it until it breaks and needs fixed.
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Old 07-07-2014, 02:11 PM
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Re: 42RE Transmission Fluid Change

When i had a worn clutch in my transmission, there was a black sludge on the bottom of the pan. It came from the clutch lining.
Only if a clutch lining is completely worn away, metal shavings could come from the discs, but you will get a slipping clutch in that case and the fluid will burn soon.
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Old 07-07-2014, 04:44 PM
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Re: 42RE Transmission Fluid Change

Quote:
Originally Posted by Frango100 View Post
When i had a worn clutch in my transmission, there was a black sludge on the bottom of the pan. It came from the clutch lining.
Only if a clutch lining is completely worn away, metal shavings could come from the discs, but you will get a slipping clutch in that case and the fluid will burn soon.
I didn't have any black sludge in the pan. The fluid was dark red, but it appeared to be clean and there wasn't any sludge in it. I even checked it this morning and there's nothing on the bottom of the fluid in my drain pan.

All I found in the pan was a magnet that appeared to have a grey paste stuck to it and that piece of metal. I was assuming the grey past was some sort of clutch material (I don't ever touch automatic transmissions, this is the first time I've done so much as change the fluid). Whatever it was it came off on my finger as a pasty looking material and it had to be magnetic since it was on the magnet.

The transmission is working fine so I wonder what it is. Either way, I know a 1" chunk of metal isn't good and my transmission will likely go out before too long. There's nothing I can really do unless I want someone to rebuild it now. I'll continue on until I make a decision on which way to go.
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Old 07-07-2014, 09:03 PM
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Re: 42RE Transmission Fluid Change

The metal color paste type stuff is most probably very fine metal powder, which comes from wear. I would not worry too much about that. The circlip or snapring could be from the reverse clutch. I have red about more cases where the snapring broke and finally reverse stopped working.
It stil can be an other snapring though. You could wait until something happens, but you will take the risk that broken pieces of the snapring will destroy other parts of the transmission.
Attached a picture from an other broken snapring out of the 42RE
Attached Images
File Type: jpg IMAG0449.jpg (184.6 KB, 8 views)
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Old 07-08-2014, 04:51 PM
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Re: 42RE Transmission Fluid Change

^^^
Yup, that's what it looks like (except the piece I have is much shorter).
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Old 07-08-2014, 11:59 PM
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Re: 42RE Transmission Fluid Change

Some googling learned that most probably the piece of snapring is from the OD-direct clutch. They are very common to break. As long as still some part of the snapring is in place, you will not see any strange behaviour from the transmission. Once the whole snapring is gone, you will loose reverse and also engine breaking in lower gears.
The good thing is that for repair the transmission doesn´t have to be removed, only the OD section, which sits on the aft side of the transmission.
There is a very strong spring in the OD-clutch, so any repair must be done by a specialist or at least by someone who knows what he is doing, or otherwise serious personal injuries can occur.
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Old 07-11-2014, 10:48 AM
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Re: 42RE Transmission Fluid Change

Quote:
Originally Posted by Frango100 View Post
Some googling learned that most probably the piece of snapring is from the OD-direct clutch. They are very common to break. As long as still some part of the snapring is in place, you will not see any strange behaviour from the transmission. Once the whole snapring is gone, you will loose reverse and also engine breaking in lower gears.
The good thing is that for repair the transmission doesn´t have to be removed, only the OD section, which sits on the aft side of the transmission.
There is a very strong spring in the OD-clutch, so any repair must be done by a specialist or at least by someone who knows what he is doing, or otherwise serious personal injuries can occur.
Yeah, any automatic transmission work goes to a specialist for me. I've rebuilt manual transmissions, but those are easy and simple. Automatics, I just write a check.
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