torque converter not unlocking
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Cargo Master
Joined: May 2001
Posts: 3,208
Likes: 13
torque converter not unlocking
Friend asked about replacing his tranny It is a 4r70w in 1998 f-150 2wd. It stalls engine when you come to a stop, Shop diagnosed it as TC not unlocking. Shop wants to replace the entire tranny for 3g's He doesn't have 3 grand. I was thinking replace the TCC solenoid and see what happens. Any thoughts on this would be appreciated.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
Likes: 2,669
From: SE Florida
Why randomly replace parts? Is the solenoid bad? Is it a wiring problem? Maybe a stuck valve? How about low trans fluid? Any of those could do it. A little diagnosis could save a lot of money.
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Cargo Master
Joined: May 2001
Posts: 3,208
Likes: 13
There are no codes active or pending. Brake position switch appears to be working. I think I will disconnect the purple with yellow stripe wire from the transmission connector and see it the TC stays unlocked.
Transmission Rebuilder
Joined: Jul 2008
Posts: 1,570
Likes: 63
From: North Georgia
I would not think it would be electrical, its more that likely being applied due to a leaky circuit or its just a bad converter. I very rarely have to replace the tcc solenoid, my first thought would be a missing or deteriorated rubber check ball inside the valve body (#7). You will have to remove the valvebody and its top plate to check, make sure you have new valve body gaskets because the will tear.
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