Eff. My trans has internal break. Epoxy? (Page 4/5)
Raydar APR 07, 08:04 PM

quote
Originally posted by sourmash:

These are things the trans shop wouldn't tell me. They really must just want to do full rebuilds only and actually have done 2 for me, plus others for family.
...



i'll probably catch some crap for this, but you would think that they'd cut you a little bit of slack, and give you some information, seeing as how deep you were, into this madness.
Have they got to milk a loyal customer for every_freakin'_ penny?
sourmash APR 07, 08:39 PM
Been wondering...
sourmash APR 11, 05:38 PM
sigh. !st to 2nd now works. But now no 2-3 and no 3-4 shifts. Reverse works. So I have 1, 2 and reverse.

Also, these cars disengage the parking brake automatically when shifted. That no longer works either, but did before I 'fixed' it. Damn, it was better before. Now I can't drive the highways at speed. I tried running it up to 55 in D but no shift. I sorta bucked.

So what does it sound like was done improperly?
OldsFiero APR 16, 07:25 AM
Oops! Shift sol B is on in 3rd and 4th, off in 1st and 2nd. stuck 2-3 shift valve = same result. I think there is only one channel plate, but there are different separator plates. Not sure if they are just calibration differences. I don"t know what combination you used.
Marc
sourmash APR 16, 08:07 AM
Yeah, it's gotta be something there. I'm going to invest in a clean catch pan and filter media to recycle my $50 trans fluid instead of buying $50 more.

EDIT: Taking off another car's valve body to swap on pointed out something I didn't do. This probably explains my auto park brake and backup sensor inops. Wonder what happens regarding shifting if I didn't link that lever in like this one is? Because I didn't and wonder if that's all my trans problems.



THIS WAS THE ORIGINAL POSTING: I compared the channel plates before assembling the new setup and they were the same. Separator plate too, from my untrained eye anyway. Only found 1 separator plate avail for my year. My vin 9 trans is a 2001. The replacement trans is almost lost in memory, but was def a vin 9 and pretty sure it was a 2001, but only used the channel plate, so. Waited a long time to find correct trans and it is. Vin 9 is DTS/STS. The valve body and other pieces weren't exchanged. With new solenoids I was surprised to have this. Decided to pull a complete valve body assembly from another trans I just located and will stick that in to try. I expect this will fix my shifting but not my auto-brake release issue or the backup sensor inop issue.

Stopped at a different trans shop yesterday to pick brains and found he had a ATSG tech manual for a 4t80e he said he would never use and bought that from him. Based on the troubleshooting bits and both gears being inop it looks like maybe "misassembled". I'm going to replace the wiring harness too. The schematic also shows a spring under the 1-2 accumulator that I don't remember ever seeing. Maybe what I heard fall out when pulling valve body assembly is what is causing the parking brake auto release issue.

So with the shifting issues, valve bore plug? Debris? Wiring problem? But with the replacement valve body I can't change the solenoids without removing the valve body to get at the retaining clips (maybe accumulators--can't remember now, so...what to do? Just swap it as is and later change solenoids once it's cleared as working?



971 was not installed under 1-2 accumulator if it was a loose spring.

[This message has been edited by sourmash (edited 04-16-2020).]

OldsFiero APR 16, 08:46 PM
Been a while since working on these, but if you didn't link up the IMS right that could be it. Not sure it will fix everything though. The ATSG chart lists all possibilities. Hard to sort out without a working knowledge of operation. Hydraulic charts mean more to me. Mismatched parts are probably not a problem. I wouldn't be concerned about the missing 1-2 accumulator spring now. It's a trim spring not used on all models. When you install the replacement VB, just make sure everything is hooked up right and let us know.
Marc
sourmash APR 17, 07:02 AM
I'm thinking my alternate channel plate didn't have the trim spring when I took it down. The two plates have a different date ink stamped on them. The one I just found has the earlier date too.

Replacing the entire VB is the smart money. I've learned that I'm not that smart, oh-no. Meaning I'm considering just hooking up the pressure switch and seeing what happens...because I can't stand not knowing if that is the fix.
OldsFiero APR 17, 07:20 AM

quote
Originally posted by sourmash:

I'm thinking my alternate channel plate didn't have the trim spring when I took it down. The two plates have a different date ink stamped on them. The one I just found has the earlier date too.

Replacing the entire VB is the smart money. I've learned that I'm not that smart, oh-no. Meaning I'm considering just hooking up the pressure switch and seeing what happens...because I can't stand not knowing if that is the fix.



I'm the same way. Should've asked a long time ago, but there is no mention of a scan tool. Scan data would show selector position right away. Codes?
Marc
sourmash APR 17, 09:13 AM
No scan since pulling the VB off to replace solenoids. I'd like to have a scan tool. Any recommendations on an affordable one for unemployed people?
Dennis LaGrua APR 18, 07:45 PM

quote
Originally posted by sourmash:

No scan since pulling the VB off to replace solenoids. I'd like to have a scan tool. Any recommendations on an affordable one for unemployed people?



Buy an ELM 327 Bluetooth/WiFi interface plug in that goes on your OBD2 diagnostic connector. Should cost less than $10 on eBay. Nest go to your apps store and buy, try or find a free OBD2 diagnostic app for your iPhone or Android. Shouldn't cost much

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