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98 blazer 4x4 in and out of overdrive

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  #21  
Old 06-02-2010, 05:35 PM
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Originally Posted by swartlkk
blazer073, that little bit of change could just be the PCM altering the TCC lockup for the conditions. 50mph is a 'tweener' speed where the TCC first starts to lock up when cruising, but may unlock given calculated engine load. Does it do this while you are running at say 55mph or 60mph on smooth level ground?
Yeah, I was setting the cruise at 40, 45, 50, 55, and 60 mph it won't do it at 60, but will happen at all the other speeds. Below 40 and above 60 it doesn't happen.
 
  #22  
Old 06-02-2010, 06:55 PM
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Originally Posted by shawn89
Mine will do it at any speed even up to 90mph
Originally Posted by blazer073
Yeah, I was setting the cruise at 40, 45, 50, 55, and 60 mph it won't do it at 60, but will happen at all the other speeds. Below 40 and above 60 it doesn't happen.
Both of you could have torque converter clutch issues, but to different degrees. It would probably pay to have it checked out by a competent transmission shop or two.
 
  #23  
Old 06-03-2010, 03:20 AM
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Thanks for the info Swartlkk. If you get yours checked before mine Shawn89 can you post the results? That video quality wasn't too shabby for a phone. I love my Droid!

It's off topic but, did the oil pressure and everything else look good?
 
  #24  
Old 06-10-2010, 09:30 AM
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my gf's bravada used to do that at 45mph first (the rpm needle would jump around 100-200rpm). running somewhat low on fluid. added a bit, it stopped, but started doing at 35mph (all at a constant throttle). i thought it was the tps acting up, but last week the truck started slipping in all gears (the trans line was leaking). fixed that, added fluid and came to find out she doesn't have overdrive anymore. is the torque converter completely messed up now? appreciate any help, guys!
 
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