Need a idea on why my transmission does this? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 07-14-2014
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Need a idea on why my transmission does this?

Okay any other time when not wot it shift perfect but if I gun it and keep it wot after I pass 60mph it almost stalls there for a couple seconds then shifts or I have slightly let of the throttle is that a shift point problem or torque converter thing. Let me know. (99 ford ranger 4.0l 4x4 trans rebuilt 20-30k miles ago and nearly fresh trans fluid change not full flush and some Lubeguard) thanks.
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Old 07-23-2014
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sounds like the torque converter lockup servo is NOT disengaging when is should

sounds like PCM software issue
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Old 07-23-2014
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So need like a tune chip to fine tune this
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Old 07-23-2014
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i would try the dealership 1st

a diagnostic would tell you what the problem is , probably just a failed lockup servo
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Old 07-23-2014
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Wouldn't that come up on a check engine test?
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Old 07-24-2014
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not sure about the older rangers , but the newer ones would probably store a code

my mazda b4000 tranny was acting a bit odd , when i had it in for service, they ran a diagnostic and sure

enough , it was showing a code for a failed lockup servo , i was having the tranny fluid lushed and filled at that time anyway.

so they just went in and replaced the servo without question
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Old 07-24-2014
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This trans is rebuilt like 20-30k miles ago and I just want to have this thing shifting correctly. It just irritates me thati get to 60 and just feels like I'm stuck there for a second or so throwing rpms and gas in bc it won't shift over fast enough.
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Old 07-24-2014
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the 4r55e and the 5r55e are computer controlled transmissions

the dealership mechanic can adjust the shift and lockup rpm`s in the PCM software itself
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Old 07-24-2014
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If the battery were ever to get disconnected would it get erased
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Old 07-24-2014
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yes , the software would revert to factory setup mode

the newer rangers have more advanced software that would revert to re-learn mode
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Old 07-25-2014
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That's why I just suggested getting a tuner chip that allows you to change gear ratios
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