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2006 Trailblazer. Started loud whine with exceloration

RPM idles at 1900 and reaches near 3000 before auto shift occurs. Loud whine heard whenever excellorator pressed.

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Service Bulletin Num : 030417002 Date of Bulletin: DEC 01, 2006

NHTSA Item Number: 10001111



I just went through the same problem with my SS. It had 3000 miles on it and it was whinning while turning either left or right. I took it to the dealer and they replaced the entire rear axle. I am not the first person that I know to have this problem. I was told that there was a problem with some of the rear ends and I have had no further problems since having mine replaced.
Thank you for using Fixya and good luck

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Thanks for using FixYa!

I understand that you are having transmission problems. Sadly there is only one solution with the problems that you have mentioned. You need to have your automatic transmission overhauled.

I hope you get this problem sorted out right away. Have a nice day.
- HotRatchet

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I just purchased an 03 Trailblazer LS 4x4, the salesman said it has an electric fan, which I'm not familiar with. Is it supposed to be loud when accelerating? It does seem to "shift" down as the vehicle...

Siunds more like a visous clutch fan. It's bolted tho the water pump hub and belt driven. Electric fans are attached or mounted against the radiator and are driven by an ekectric motor that is relay controlled. Electric is quieter, yet can be heard when they kick in. Only because it is at an idle or low speed.VC fans can be very noisey depending onwhar srage of engagement it's in. Both fans are negated by the ram air effect at speeds above 35 mph. If your fan is noisey throughout the acceleration and shift range and variable levels of noise are exoerienced in down sgifting, You have a viscous clutch fan.

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