Question about Chevrolet Silverado 1500

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2004 Chevy Silverado 1500, 92,000 mi Transmission shifts harder than normal, but only slightly. After vehicle has been run, for a hour or so, transmission does not want to shift into overdrive. At 60-65 mph tach is at approx 2800 instead of 1800-2000 (normal). Otherwise transmission seems smooth in all gears. Fluid is clean and at proper level. Hopefully this is not a transmission problem, but instead something that regulates shifting.

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I assume you checked the fluid level and color already as that’s the first thing to check. It should be clear cherry red in color and at the right level with the engine warm, running and in park. I suspect you have either a clogged valve problem . If so, you should first do the simplest and easiest thing and run some Seafoam Trans Tune in the transmission for a few days and then flush the old ATF fluid and replace the fluid and filter.

The Seafoam will clean out the varnish or gunk that may be causing the valve or clutch pack to stick. Try replacing the old ATF with a compatible synthetic ATF fluid like Mobil1 or Redline as they are a bit slippery than the regular ATF Fluid and will further help clean deposits out. Remember that just like oil changes, the transmission fluid should be changed every 30K miles or every 2 years, whichever comes first! Good luck!

Posted on Apr 27, 2010

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