Bad Valve Body Or Worse?

[MidnightTrain6_7]

So, I got the dreaded P0871 code, but I put it in manual and drove the truck for a little bit against my best judgment.

I got the incorrect gear ratio code for 4th, 5th, and 6th.

I took a trans-fluid sample and sent it to Black Stone for analysis.

These were the comments: “Universal averages for this type of transmission show typical wear once about 40,000 miles have accrued on the oil. Here, we're finding quite a bit more aluminum and iron, but if this oil run was longer than average, that might not be cause for concern. Wear metal accumulates with use, so if this transmission shifts normally, we suggest checking back on a known interval for another look. The viscosity of this fluid was right on target, but note insolubles were above the 0.1% limit, so we suggest an oil change to prevent those turning the oil abrasive. Check back.”

I think in my heart, I know I probably ruined the clutches, but part of me wants to replace the valve body and hope for the best.

I just ordered EZ Lynk to check my CVI.


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[AK Bob]

I agree that collecting CVI values is a good idea.

Attached is the troubleshooting information for the P0871 code.

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[MidnightTrain6_7]

I agree that collecting CVI values is a good idea.

Attached is the troubleshooting information for the P0871 code.

The only thing that has me thinking it’s something more is that I was about to order a babymaker from Randy’s, but he’s got a disclaimer that if you have the incorrect gear ratio code, the valve body won’t fix it, and the trans is hurt.

Also, if the valve body is bad, will that negate the CVI numbers?

I’ve read many threads and haven’t seen anyone ask or answer that.


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[AK Bob]

The only thing that has me thinking it’s something more is that I was about to order a babymaker from Randy’s, but he’s got a disclaimer that if you have the incorrect gear ratio code, the valve body won’t fix it, and the trans is hurt.

Also, if the valve body is bad, will that negate the CVI numbers?

I’ve read many threads and haven’t seen anyone ask or answer that.


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Good question.

Hopefully, some of our 68RFE guys will have an answer on that.

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[Corkey]

If the valve body is bad or cross leakage at the plate, your CVI numbers will change.

It's the heart of our automatic transmissions.

Any decent scan tool will tell you what those numbers are for the 2C 4C and so on.

Give me a minute, and I'll try to find the "stock" CVI numbers.

Keep in mind that if you have a transmission tune engaged, this will show different numbers.

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[Corkey]

https://www.igotacummins.com/threads...Pressures-CVIs

If they are close to those values, you're fine.

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[MidnightTrain6_7]

We shall see.

The worst part is I need to find a new tune once I get the new valve body/rebuild the trans.

I’ve seen on some threads that DRD is no longer in business.


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[Corkey]

https://www.igotacummins.com/threads...bership-(PLUS)!

I would strongly suggest looking into this.

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[MidnightTrain6_7]

https://www.igotacummins.com/threads...Pressures-CVIs

If they are close to those values, you're fine.

So, I’m getting roughly the same numbers except for 2C and 4C.

My torque converter slip is way off, and my OD CVI is sitting at 0.




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[AK Bob]

So, I’m getting roughly the same numbers except for 2C and 4C.

My torque converter slip is way off, and my OD CVI is sitting at 0.

https://uploads.tapatalk-cdn.com/202...a4eccc5351.jpg


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Found this link that addresses the overdrive clutch CVI value of zero meaning, if it helps any.

https://revmaxconverters.com/transmission-cvi-mean/

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