47re wont lock up at all now

[Ronnie Haycraft]

I have had this issue for around 6 months or so.



I will start from the beginning...



Rebuilt transmission 1 year ago.

5-6 months later no lock up.

Tested alternator

Cleaned grounds

Monitored transmission via snap on scanner

Wired in lock up switch

Added noise isolator

Tested continuity on lock up cable to PCM.

Tested apps

Changed VB

Changed solenoids

Changed OSS

Tested brake light switch

All came back good

Trans doesn't slip

TC when it was locking didnt slip at all





TC would lock up only if coasting whilst feathering throttle around 5% tps input. it would lock flick the lock up switch and it would stay locked



Flick the switch and coast it would eventually lock up and stay locked



We had a our first frost friday night saturday TC wont lock at all no matter what..

Done the ATS apps re wire today made no difference other than throwing p0121 code tonight. I'm at a complete loss the only issue I can find is the 8 pin connector on the trans doesn't seat all the way down but this has been like this for the last 2 years no issue.. I have now ordered a connector to replace that.



Does anyone have any further suggestions?

Anyone give me a list of problems that will cause a no lock up situation.

Does this sound like the TC may be toast even though when it did lock it wouldn't slip at all?

Do I buy a standalone controller if so what one is recommended.





Thank you

 

[BigPapa]

Questions:

• What truck are we talking about?
• How is your lock-up switch wired?

With a properly wired TC lock-up switch, the TC will lock and stay locked no matter what. A controller will not help with your issue. I’d suspect you have a wiring or connector issue. If the connector is not seating as it should, something is wrong.