- 1). Test drive your GMC Sierra, listening closely for any unusual noises, such as a clicking or clunking when you're cruising at a low speed, a clicking noise when you turn or clunks when you round a corner. Any of these noises could indicate trouble with the drivetrain.
- 2). Raise the hood on the truck to check the oil and transmission fluid levels. Both have metal sticks that you pull out. You'll find the dipsticks on the Sierra near the back of the engine block on the passenger side.
- 3). Wipe the dipsticks with an old rag and reinsert them into their respective holes. Gauge the level of fluid in the container. Add more, if it falls below the full mark.
- 4). Inspect the truck's drivetrain visually. Roll under the truck on a creeper and look for any signs of breakage or wear on the axles that connect the driveshaft to the wheels. Check the front and rear axles, halfshafts and CV-joints.
- 5). Look for seepage of fluids from the joints and seals. Pay attention for dry rot or cracking in any of the hard plastics that make up the boot covering of the axles.
- 6). Slide out and check all the hoses and clamps coming out of the air and oil filters and from the engine. The warranty doesn't cover them and it could create bigger problems, if they're allowed to break.
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