E4OD Torque Converter Lock Up Behavior
Fleet Owner
Joined: Jul 2006
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From: Mi'kma'ki
Hey guys, I'm hoping Mark Kovalsky sees this as I know he is the transmission guru here. My truck is a 1990 F250 with the E4OD/460.
This is more my curiosity than anything, but does the E4OD unlock the torque converter just before the shift to overdrive? I've always noticed a smaller RPM drop after the shift to overdrive, which I assume is the torque converter clutch locking up, but since it typically locks up right after it shifts to 3rd, that would indicate that it unlocked before the shift to overdrive. If this is the case, what would be the rationale for it? Would the shift to overdrive be harsher with the converter locked vs unlocked? Thank you!
This is more my curiosity than anything, but does the E4OD unlock the torque converter just before the shift to overdrive? I've always noticed a smaller RPM drop after the shift to overdrive, which I assume is the torque converter clutch locking up, but since it typically locks up right after it shifts to 3rd, that would indicate that it unlocked before the shift to overdrive. If this is the case, what would be the rationale for it? Would the shift to overdrive be harsher with the converter locked vs unlocked? Thank you!
There are no problems at all then. Your trans is working as designed.
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