Question about 1995 Chevrolet K1500

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95 suburban with 4l60e and manual transfer case. shifts rather high in 2wd but livable. when in 4wd high it shifts into 4th and torque converter goes into lock up mode. shifting to third gets it moving again but shifting to od immediately locks the converter again. does the transfer case gear selection interact with the computer control of the transmission or is there a wiring problem?

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  • techman55200 Dec 13, 2009

    seems to go through the gears very quckly all in by 30 mph and no torque multication. can only regain acceleration by shifting manually to drive from over drive. shifting back to od once some speed has been gained generates the same lack of throttle response.

  • techman55200 Dec 13, 2009

    this lcokup lack of torque multipication/throttle response only happens when in 4wd mode on the transfer case

  • techman55200 Dec 14, 2009

    when in 4wd it is in fourth with the converter locked up. terationap ther brake and the converter unlocks. release the brake and the converter immediately locks again. converter does not lock up in third in 4wd. normal shift sequence in 2wd with shift points at about 2500 rpm under normal accelleration. 500 rpm drop approximate when converter locks in fourth. very sensitive to load as to dropping out of lockup when below 50 mph. hoping this helps

  • 6bta May 11, 2010

    What do you mean "goes into lock up" ?

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Sounds like a solenoid problem or trans module,

Posted on Dec 13, 2009

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