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Have 2007 Kenworth T800 that shakes at 45-50 mph what could it be?

Here are some potential causes for the shaking at 45-50 mph in your 2007 Kenworth T800:

1. Unbalanced Tires: Unbalanced tires can cause vibrations at certain speeds. Check if the tires are properly balanced and evenly inflated.

2. Driveline Issues: Worn or damaged driveline components, such as universal joints, driveshaft, or differential, can cause vibrations. Inspect these parts for any excessive play, cracks, or damage.

3. Wheel Alignment: Improper wheel alignment, particularly toe-in or toe-out, can lead to shaking. Have the wheel alignment checked and adjusted if necessary.

4. Loose Components: Check for any loose parts or fasteners on the suspension system, steering components, or engine mounts. Loose bolts or brackets can cause vibrations.

5. Suspension Problems: Worn or damaged suspension components, such as shocks, springs, bushings, or control arms, can affect the stability of the vehicle and lead to shaking. Inspect the suspension system for any signs of wear or damage.

6. Engine Issues: Certain engine problems, such as misfires, can also cause vibrations. Ensure the engine is properly maintained and functioning correctly.

7. Aerodynamic Issues: In some cases, aerodynamic disturbances caused by modifications or damage to the truck's exterior can create shaking. Check for any issues with the aerodynamic components like the mud flaps, fairings, or spoilers.

8. Brake Issues: Warped or damaged brake rotors, uneven brake pad wear, or a dragging brake caliper can cause shaking. Test the brakes for any abnormal behavior or juddering.

9. Steering System Problems: Worn or damaged steering components, such as tie rods, ball joints, or power steering pump, can affect the vehicle's stability and cause shaking. Inspect the steering system for any play or issues.

It's important to have a qualified mechanic inspect the vehicle to properly diagnose the root cause of the shaking and ensure a safe and smooth ride.