No 3rd or 4th after "Rebuild"
Thread Starter
Teching In
Joined: Mar 2017
Posts: 9
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No 3rd or 4th after "Rebuild" I had a slipping 2-4 band and decided to fix it myself.
Long story short. I ****** up something and now I have only R, 1st and 2nd. It is no difference if I select 2, 3, or D. The transmission shifts very firm into 2nd and then it dosen´t even try to shift to 3rd. It stays in 2nd to the redline.
It is not like it tries to shift to 3rd and the 3-4 clutches are slipping. It stays locked in 2nd.
What I did was change band and the burnt drum. Installed a sonnax super hold 2nd gear servo and a Sonnax billet 1-2 accumulator.
Any suggestions to what might causing this problem?
Long story short. I ****** up something and now I have only R, 1st and 2nd. It is no difference if I select 2, 3, or D. The transmission shifts very firm into 2nd and then it dosen´t even try to shift to 3rd. It stays in 2nd to the redline.
It is not like it tries to shift to 3rd and the 3-4 clutches are slipping. It stays locked in 2nd.
What I did was change band and the burnt drum. Installed a sonnax super hold 2nd gear servo and a Sonnax billet 1-2 accumulator.
Any suggestions to what might causing this problem?
Launching!
Joined: Feb 2015
Posts: 203
Likes: 6
How are you confirming that it doesn't try to shift into 3rd? Do you have a data logger of some sort? When my 3-4 clutch crapped out, it was like it stayed in 2nd as well, but it was indeed trying to shift into 3rd. There was just no third to be had
Thread Starter
Teching In
Joined: Mar 2017
Posts: 9
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Are you sure you did not notice it tried to change gear from 2nd?
Thread Starter
Teching In
Joined: Mar 2017
Posts: 9
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Here you can se a video of how I would expect transmission with a 3-4 clutch failure would behave.
This is NOT the way my transmission behaves.. It behaves just like when you put the gear selector in 2.
This is NOT the way my transmission behaves.. It behaves just like when you put the gear selector in 2.
Last edited by EspenT; Mar 28, 2017 at 01:54 PM.
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From: Ann Arbor, MI
At a minimum you had to remove the pump.
Here are some possibilities that come to mind:
Therefore, one of the teflon rings on the input shaft may have been damaged during the process. Or you pulled sideways so hard on the input shaft that it is now loose in the input drum.
Here are some possibilities that come to mind:
Therefore, one of the teflon rings on the input shaft may have been damaged during the process. Or you pulled sideways so hard on the input shaft that it is now loose in the input drum.
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Thread Starter
Teching In
Joined: Mar 2017
Posts: 9
Likes: 1
At a minimum you had to remove the pump.
Here are some possibilities that come to mind:
Therefore, one of the teflon rings on the input shaft may have been damaged during the process. Or you pulled sideways so hard on the input shaft that it is now loose in the input drum.
Here are some possibilities that come to mind:
Therefore, one of the teflon rings on the input shaft may have been damaged during the process. Or you pulled sideways so hard on the input shaft that it is now loose in the input drum.
The valve body vas also removed. Could the 3-2 valve / solenoid be stuck and constantly trigger a 3-2 downshift?
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Joined: Feb 2015
Posts: 203
Likes: 6
Pump and all the drums where off. Not sure how the input shaft cab become loose? Teflon rings looked good before I mounted pump, but something could have happened when pump was reinstalled. Will one of them cause my problem? Problems in reverse seems to be the most common result of bad teflon rings?
The valve body vas also removed. Could the 3-2 valve / solenoid be stuck and constantly trigger a 3-2 downshift?
The valve body vas also removed. Could the 3-2 valve / solenoid be stuck and constantly trigger a 3-2 downshift?
Ive had the 3-2 go out once. It triggered a P0785 code and maxxed out the line pressure in the trans
Last edited by SiskMan; Mar 29, 2017 at 07:47 AM.
Thread Starter
Teching In
Joined: Mar 2017
Posts: 9
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Only removed the VB. Don´t have any codes. Will inspect for stuck valves or missing check ***** tonight.
Moderator
Joined: Aug 2010
Posts: 7,323
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From: Ann Arbor, MI
The teflon rings for the input shaft ride inside the stator shaft of the pump.
Damaging one would prevent the 3/3 clutch from applying.
A missing check ball causes abrupt clutch apply, not loss of a clutch.
Damaging one would prevent the 3/3 clutch from applying.
A missing check ball causes abrupt clutch apply, not loss of a clutch.
Thread Starter
Teching In
Joined: Mar 2017
Posts: 9
Likes: 1
I gave up on this.. Pulled the valve body and installed a sonnax performance kit. Afterward it would shift from 2nd to 3rd but the 3-4 clutch would not engage/was slipping.
It´s now at a transmission repair shop for a complete rebuild.
It´s now at a transmission repair shop for a complete rebuild.
Launching!
Joined: Feb 2015
Posts: 203
Likes: 6
Sorry to hear that. At least you'll get it up and running, and that's what really matters
