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Power Strokes
94-97 Tech
4r100
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[QUOTE="oldschool, post: 1561171, member: 1457"] 4r100 stall in reverse I've got a 2002 4r100. had a leak in the cooler line and lost enough oil, it quit moving on the highway. shut it down, fixed the leak, refilled, and now it locks up in reverse, 2nd and low. from what i've read on other sites, everything pointed to TC and or oil pump. Check Pressures at idle and stall, and all were within spec. Have no codes. I pulled the pump, and it did look ok. replaced pump, TC and still had same issue. Replaced the solenoid pack with no change. I did change the PCM with another known good PCM with no change. Cant find anything on exactly how the TC lockup works. If oil pressure or fluid level is low, and TC locks up, does that mean that the TC lockup is spring applied, and oil released? The TC lockup solenoid lets pressure to release? so is there something in the valve body that could be plugged and not allowing pressure to unlock the TC? I haven't really found any systems operations or trouble shooting help anywhere. [/QUOTE]
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