reverse TQ converter lock up - Ford Powerstroke Diesel Forum
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Old 07-06-2010, 01:47 PM
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reverse TQ converter lock up

it sounds like when i put my truck in reverse the torque converter is locking up the idle goes up then lags right down almost like the clutch is enageing to fast....it someitmes causes my truck to stall out....any ideas on whats going on??
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Old 07-06-2010, 01:56 PM
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low trans fluid?? Filter fell out of the hole, drop the pan to look. Blown trans, sorry to say.
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Old 07-06-2010, 02:00 PM
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From worst to best case scenario.

Weak/scored pump
Leaking internal seals
Cracked/loose filter
Low fluid level

What is going on:
The transmission is very oil-hungry during a reverse shift so the pressure is jacked up. After time, the teflon seals (and even sometimes the rubber piston seals) begin to leak internally. Normally, this isn't a big issue. However, when enough pressure is dropped, it allows the torque converter clutch to partially apply, bogging or stalling the engine.

Sometimes, the filter housing can become loose and the pump can begin sucking air (same as a low fluid level concern). This causes a fluid starvation issue that can cause low pressure as well.

If the pump housing or gerotor is scored, then fluid pressure losses will also occur.

Best fix:
Rebuild with a new pump housing and gerotor.
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Old 07-06-2010, 02:01 PM
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well the torque converter on has 50,000 on it....i just had a new shortblock put in and it started doing this when i got the truck back...i wasnt about to bring it back to the guy who put the motor in....lets just say he took his sweeeet *** time...the bill was cheap but i was with out a vehicle for so long.
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Old 07-06-2010, 02:03 PM
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when he had the engine pulled the truck sat outside in the winter for a month or so...im not sure if the bell housing was covered or not...maybe the seals did dry rot from being exposed to the elements for so long??
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Old 07-07-2010, 10:17 AM
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Hi, My truck did that every once in a while. Then it started doing it a lot but mostly when cold. It even did it as I slowed for a roundabout (dont think you have those). Eventually it started taking ages to shift from 1st to 2nd then I lost all drive. See the thread http://www.powerstroke.org/forum/99-...all-drive.html
Best of luck with yours.
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