4wd affected acceleration

2008 CHEVROLET TRAILBLAZER
140,000 MILES • 4.2L • 6 CYL • 4WD • AUTOMATIC
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BIGBLUEITCH
  • MEMBER
  • 1 POST
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?
Feb 9, 2020 at 11:32 PM
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JOETECHPRO
  • ✓ASE Certified Mechanic
  • 705 POSTS
  • ASE Certified Mechanic
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
Feb 9, 2020 at 11:55 PM
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