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  #21  
Old 05-09-2019, 08:03 PM
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Originally Posted by RRPhil View Post
The symptoms are certainly similar. However, transmissions which left the production line at Saarbrucken after the middle of November 2000 were fitted with the stiffened A-clutch drum. The 10mm land main pressure regulator valve also largely fixed the pressure spike issue which was causing the earlier A-clutch retaining ring groove failures. As yours is a 2001 model it should have the stiffened drum fitted. Do you happen to know if its serial number (on the green plate rivetted to the LH side of the maincase) is greater than 355863?

Phil

I would look to see what it is but I am not sure it would be helpful because this transmission was rebuilt twice (car is almost at 210k miles) already. It's been 30k miles after it was built the last time and we have been driving it very gently since then. That is why I am a little surprised it would go bad so quickly.


I am reading the valve body 'orifices' may also cause some similar issues, so I will get the Sonnax valve body rebuild kit and replace everything next..


Thanks,


Ozzie
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  #22  
Old 05-11-2019, 11:36 AM
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Originally Posted by turquise1 View Post
I would look to see what it is but I am not sure it would be helpful because this transmission was rebuilt twice (car is almost at 210k miles) already. It's been 30k miles after it was built the last time and we have been driving it very gently since then. That is why I am a little surprised it would go bad so quickly.


I am reading the valve body 'orifices' may also cause some similar issues, so I will get the Sonnax valve body rebuild kit and replace everything next..


Thanks,


Ozzie



Another quick update :


I measured the main pressure valve that I replaced and it actually is the older model. It's replaced with the TransGo model anyway. So unless they put the new stuff in when they rebuilt my transmission, I may still have the old stuff in there (I'd doubt that)..



Also, after a bit of driving, I noticed that there is improvement in such a way that I can make the gear engaged in manual mode (when not engaged to D in auto mode) if I switch to 2 from 1.



I started believing my car is having fun effin with me at this point


Please let me know if you can make sense out of all this..


Thanks,


Ozzie
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  #23  
Old 05-11-2019, 11:50 AM
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If I read correctly you removed and replaced the valve body keeping the old seals. The symptoms sound like loss of pressure so either a seal, the primary pressure solinoid or the whole valve body. Were that my transmission is replace the solinoid responsible for getting into 1st and all the rubber seals on the valve body.


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  #24  
Old 05-11-2019, 12:10 PM
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If I read correctly you removed and replaced the valve body keeping the old seals. The symptoms sound like loss of pressure so either a seal, the primary pressure solinoid or the whole valve body. Were that my transmission is replace the solinoid responsible for getting into 1st and all the rubber seals on the valve body.

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Yes, I will do that next. I am looking for a valve body kit online. Unfortunately, they doubled the price from $135 to $270. Please let me know if you know a better deal.



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  #25  
Old 05-11-2019, 07:19 PM
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It worries me that you would be speculatively chucking that much money at it, just hoping that the valve body is the issue. If at all possible, youíd be better getting the valve body tested first as a unit.

In case thereís any confusion regarding seals, both the GM 5L40-E transmission and the later ZF 6HP26 have rubber jump tubes that seal the hydraulic passages that pass between the casing and the valve body. For the ZF 5HP24, however, there are no rubber seals and it relies on the flatness & finish of the machined faces to provide a seal.


GM 5L40-E



ZF 6HP26



ZF 5HP24


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  #26  
Old 05-12-2019, 11:43 AM
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Hey RRPhil,


I am not sure where I can get this tested in Chicago. I also do not have a garage so everything I do usually needs to be done in a day or so, so I do my best to fix things quickly.


I have noticed there are no seals at that location and I quickly researched and found out that is how it is supposed to be.


I will keep you all updated..


Thanks,


Ozzie
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  #27  
Old 05-28-2019, 10:01 AM
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Hey RRPhil,


I am about to open up the valve body once again to replace the orifices and seals etc. (got the kit) and I would also like to do a vacuum test if possible. Do you have any resources for that process that you can share with me? Perhaps the vacuum test locations on the valve body?


Please let me know,


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Ozzie
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  #28  
Old 05-29-2019, 04:20 AM
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Iím curious which Ďkití youíre referring to. Iím not aware that Sonnax do a kit for the 5HP24. Do you mean the ZF 5HP24VBK valve body kit?



I would certainly first check all valves for delamination of the anodised spool surfaces



The two main wear areas are the main pressure valve and, to a lesser extent, the lubrication valve and Sonnax do an oversized replacement just for these two valves for the 5HP24.





For the main pressure valve I would concentrate on the vacuum readings from these three worm tracks :





Iíd be interested to see the vacuum test result you get from the TransGo valve as Iím personally not convinced about its sealing capability





Phil
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  #29  
Old 05-29-2019, 09:20 AM
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Hey RRPhil,


Yes, that is the kit I have and will be replacing everything in there including the wire harness I also purchased.



Thanks for all the great info once again.


I will let you know about the results for sure..


Cheers,


Ozzie
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