Question about 2003 Chevrolet Suburban 1500

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I have a '03 Chevy Suburban 1500, 5.3L engine. When the transmission shifts from 3rd into overdrive(4), the rpm's rev up, this doesn't happen all the time but enough to notice it! Would a tranny flush solve the problem?? I have 63,000 miles on it as well. Thanks for the help!!

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Sounds like your "lockup torque converter" is going bye bye. You can buy some time by disconnecting the wiring the engages it. Or drive around in 3rd but ultimately your tranny is going to fail from contamination. You can confirm this by dropping the trans pan and checking for debris. You probably also experienced a "shudder" or "vibration" maybe months ago instead of the reving up symptom. That would have been an early symptom. Now it's probably too late. If you do have the trans replaced, make SURE that the cooler gets a thorough flush or the life of the new tranny will be shortened.
mikethemedic in Hawley, Pa.

Posted on Jan 30, 2009

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