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4WD affected acceleration

Tiny
BIGBLUEITCH
  • MEMBER
  • 2008 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
I used 4wd a week ago and ever since then I feel my acceleration is a little slower, I hear an ever so slight humming sound from behind me that use to not be there. And to be honest I feel like I’m getting better grip on the ground, but that might just be me overthinking things. What happened to my vehicle?
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Sunday, February 9th, 2020 AT 11:32 PM

1 Reply

Tiny
JOETECHPRO
  • MECHANIC
  • 705 POSTS
Hey BIGBLUEITCH,

Can you please start by checking your tire pressures?

I know this sounds simple but low tire pressure would cause excess tire noise and drag.

Does the humming noise change as you corner?
Is it louder during a sweeping left hand bend or right land bend?

Regards, Joe
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Sunday, February 9th, 2020 AT 11:55 PM

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