1997 Chevy Tahoe two questions: transmission hard shift AND

Tiny
THEFINNS
  • MEMBER
  • 1997 CHEVROLET TAHOE
Transmission problem
1997 Chevy Tahoe V8 Four Wheel Drive Automatic 165k miles

1.) After running at highway speeds, only in the summertime, with the AC on (load on engine), after slowing down I can get a very hard shift. It resets back to normal after turning off the ignition and turning it back on. I have been told I need a whole new transmission but I can not believe it. There is NO slip in the shifting, there is no loss of power, there is NO boggong down, only a hard shift every now and again.
2.) My rear window windshield wiper only operates on one speed, not on the intermittent. I cannot figure out how to get into the wiper motor and /or the computer circuit for the rear wiper. I have already replaced the computer board for the front wiper and it repaired all the problems I was having with the front wiper and I had expected that it also controlled the rear intermittent wiper as well but nooooooo! In addition, the rear wiper no longer self parks either. Would you have any recommendations for either of the problems? Thanks You
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Monday, April 5th, 2010 AT 8:33 PM

7 Replies

Tiny
JACK42
  • MEMBER
I believe there is a valve body update that will take care of the hard shifting when hot, it shouldnt need a new trans. As far as the wiper goes, the solid state control module is located under the center of the rear window, if it is anything like the front modules it will be the problem
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Wednesday, April 7th, 2010 AT 7:48 AM
Tiny
THEFINNS
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I thank you for your reply, would you be able to tell me how to remove the cover to gain access to the circuit board on the rear window. I just cannot figure it out. There must be a secret handshake somewhere and I have a chiltons but it does not address this at all. Thanks, Russ Finn
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Thursday, April 8th, 2010 AT 6:35 PM
Tiny
JACK42
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My software doesnt tell how to remove the panel. If there are no screws visible, the panel probably just pops off. There are plastic reatainers that just snap in on most of the panels.
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Thursday, April 8th, 2010 AT 7:58 PM
Tiny
THEFINNS
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For what it is worth, there are no screws, there are only plastic caps that are locked in with a center post that is pushed in. The only way to remove them is to break the plastic heads off.
Now, I have replaced the rear window wiper computer with a new one and the wiper still operates the same way (what a dissapointment!). It still has no intermittent speed and does not self park when it is turned off - basically, there is only one speed of wiper no matter what the switch says. Any other suggestions? I did open up the motor gear box to see if there are any other electrical components and there was one small circuit board where the wires attach to the motor but I could not get it out. There only other thing in this space are the gears for the wiper. Thanks for any help, Russ Finn
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Wednesday, April 14th, 2010 AT 4:02 PM
Tiny
JACK42
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Since it wont park it may be the motor assembly. If it shuts off, the switch is telling it to shut down, and it does just not in the right place. Sometimes one part can damage another, especially since they went to solid state on the controls.I believe that board in the motor tells it to park when power is shut down, the odd part is the intermittent, that is usually controlled by the wiper module
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Thursday, April 15th, 2010 AT 7:11 AM
Tiny
THEFINNS
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When I ask my local mechanic for a valve body update, he is confused or so he says. Could you tell me exactly what a 'valve body update' entails and approx. What you think it should cost.
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Saturday, April 24th, 2010 AT 2:25 PM
Tiny
JACK42
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A trans shop would be more likely to know about it. The shop we use charges a few hundred dollars to remove the valve body and make the updates. It has something to do with enlarging a few holes to allow pressure bleed when hot so the shift softens
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Sunday, April 25th, 2010 AT 8:14 AM

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