If your 2010 GMC Terrain SLT has a clunking noise when accelerating and decelerating, it could be due to several reasons. This noise is often linked to worn-out parts or loose components.

Here are a few common causes:

1. Loose suspension parts: Worn bushings or control arms can cause clunking sounds.
2. Transmission issues: Problems with gears or mounts may lead to noise during speed changes.
3. Drivetrain problems: Worn CV joints or driveshafts can also cause clunking when accelerating or decelerating.

It’s important to have the car inspected by a professional to avoid further damage and ensure safety - https://www.cartorbo.com/2010-....gmc-terrain-slt-clun