ALL possible causes for no forward gear in 4t65e transmission? Added some clips

bp042665

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i have seen the weld in the gear in 678 break and no forward movement
 

AZilla83

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TY sir for the diagrams! Would that broken weld leave any metal in the pan or a visible crack on the gear? As far as I could tell all components from 601-688 were good, but then again I'm not exactly sure what a broken weld looks like... I could take it all apart again, but OMG it's a task! Is there a valve somewhere that could've gotten clogged or broken for the servo? I remember hearing something along that line on YT, but watched so many, can't remember exactly which one it was...
 

AZilla83

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Servo pin, I think it's called. Apparently it can be too long & there's a replacement available from sonix? Didn't catch part # or location.
 

billr

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Here is a link to another IPB, with names for the parts. The item numbers look similar, but they are not the same as the IPB that was posted by BP. BP is a trans expert, so take his advice seriously.

BP, is there any real difference between the "20 pan screw" version and the others; can we ignore that?


PS: I think it is possible for one of those welds to break, have the parts spin freely, and leave no obvious debris in the fluid.
 

AZilla83

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Here is a link to another IPB, with names for the parts. The item numbers look similar, but they are not the same as the IPB that was posted by BP. BP is a trans expert, so take his advice seriously.

BP, is there any real difference between the "20 pan screw" version and the others; can we ignore that?


PS: I think it is possible for one of those welds to break, have the parts spin freely, and leave no obvious debris in the fluid.
Mmmmm... I guess that means, I'll be taking it apart again... Also thx for that link! I think this time I'll record it on my phone & post clips as I'm going thru...
 

billr

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It sounds like you did not disassemble any of the clutches, removing the steel/friction plates entirely. You really need to do that to do meaningful inspection of all those parts. Going that deep into the trans, I would figure on replacing all seals and the friction plates/bands. Inspect the steel plates and replace only as required.
 

AZilla83

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Okay I added a cpl clips of my progress. Can someone take a look at the last one & tell me if that's normal for the forward servo pls?
 
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