EspenT

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 dosenīt 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?

wht/73

Might help to put what trans you are talking about.

EspenT

4l60E

SiskMan

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

EspenT

I might be wrong. But wouldn'tīt it release the 2-4 band when it try lock the 3-4clutch? If it does release 2-4 you will have 1st when the band is released without locking 3-4 clutch.

Are you sure you did not notice it tried to change gear from 2nd?

EspenT

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.

mrvedit

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.

EspenT

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?

SiskMan

Never thought of that. Did you actually remove the solenoids and valves inside the VB? or just the VB?

Ive had the 3-2 go out once. It triggered a P0785 code and maxxed out the line pressure in the trans

EspenT

Only removed the VB. Donīt have any codes. Will inspect for stuck valves or missing check ***** tonight.

mrvedit

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.

EspenT

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.

Itīs now at a transmission repair shop for a complete rebuild.

SiskMan

Sorry to hear that. At least you'll get it up and running, and that's what really matters

Hazmatt81

Sisk Man would you post a follow up on what the transmission shop found. I have a friend with the exact same issue

SiskMan

EspenT is the thread starter. im sure he will chime in when he finds out