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Thread: !!!48RE 2nd Gear Lockup in Drive Achieved!!!

  1. #1
    Advanced Tuner Jim P's Avatar
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    !!!48RE 2nd Gear Lockup in Drive Achieved!!!

    Screenshot of a datalog for 48RE trans tuning on a 2006 Megacab showing 2nd gear lockup in Drive!
    Attached Images Attached Images

  2. #2
    Advanced Tuner Jim P's Avatar
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    No trickery with a manual lockup switch or anything, purely stock transmission, only modification to the engine aside from tuning is 50hp injectors.

  3. #3
    Advanced Tuner JaegerWrenching's Avatar
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    Nice, did you achieve that using HPT? Also what logging software is that?

  4. #4
    Advanced Tuner Jim P's Avatar
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    I did it on UDC Pro RT, that is the datalog viewer that comes with UDC Pro RT. This can be achieved on HPT as well. Don?t know how many people have said over the years that 2nd lockup cannot happen in drive with the 48RE and yesterday I received a datalog if adjustments I did to a tune to find 2nd lockup in drive had occurred.

  5. #5
    Advanced Tuner JaegerWrenching's Avatar
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    Heck yeah always nice to see the impossible done haha! Thanks for sharing and furthering the progression.

  6. #6
    Tuner PurpleRam's Avatar
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    Sweet

  7. #7
    Tuner in Training
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    Awesome!

  8. #8
    Potential Tuner
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    Hi what did you do to get 2nd gear lockup I don?t see your pics

  9. #9
    Advanced Tuner Jim P's Avatar
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    There?s a calibration revision where Chrysler activated manual 2nd lockup, getting it happen in drive is a different story and not consistent.

  10. #10
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    question. is the TCC circuit a pwm circuit? I know that the solenoid has a relay controlled 12v+ but is the negative side from the pcm just an on/off ground or a pwm ground? im having an issue wheras in 4th gear with pcm commanded lockup the TC unlocs @25-40%. unlocks even with a lockup switch on and grounded through resistor as well. Are the 2004.5 48re's mechanically designed to disengage the torque converter over 25% throttle or does a hidden pcm parameter cut fluid pressure at that throttle range to the tcc fluid circuit? parts included in build is a goerend triple disk lockup converter, hardened shafts, etc etc. thanks

  11. #11
    Advanced Tuner Jim P's Avatar
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    Something isn?t right if you have a manual lockup switch turned on and it drops out lockup if you go above 25% throttle.