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97 yukon tranny problem

Discussion in 'Chevy Trucks' started by ken119, May 3, 2007.

  1. ken119

    ken119 Junior Member
    Messages: 29

    My yukon was just rebuilt yet the tranny still shifts hard forn 1 to 2 when it gets hot (after driving about 40 miles or so). I heard the valve body could be leaking internally telling the ECM to push at full line pressure therefore causing the hard upshifts. When it does it if I shut off motor for 2 minutes and start up again it goes away completely (drives normal). Could the throttle position sensor or vehicle speed sensor cause this? The only the bad on it is a O2 sensor on the exhaust. That shouldn't cause it either? Is the valve body spendy? Any input would be appreciated.
     
  2. diehrd

    diehrd Senior Member
    from NY
    Messages: 199

    Check the Speed sensor it can defiantly cause this .
     
  3. ken119

    ken119 Junior Member
    Messages: 29

    I went to the auto parts store. They said it had 4 speed sensors. 1 in tranny for $20, 1 on side of tranny for $180, 1 on the transfer case for $162, and 1 on the rear end for $180. I'm bringing it back to the parts store, they said they could scan it. maybe they can pinpoint the problem.