2016-2020 Buick Envision Rear Drive Shaft: Diagnosing Vibrations and Noises

Critical Compatibility Warning

Symptoms of a Failing Rear Drive Shaft

A failing drive shaft typically provides clear audible and physical warnings. Ignoring these signs can lead to more significant damage to the transmission or differential. Common symptoms include:

• Vibrations Under the Vehicle: This is the most common symptom. You may feel a shudder or vibration that increases with speed. It can be caused by a worn universal joint (U-joint), a bad center support bearing, or a shaft that has become unbalanced due to damage or losing a balance weight.
• Loud Clunking or Clicking Noises: A distinct "clunk" when shifting from Park to Drive or Reverse often points to excessive play in a worn U-joint. You might also hear clicking or knocking sounds while driving.
• Squeaking Sounds: A persistent, rotational squeak at low speeds is often a sign that a U-joint is failing and has run out of lubrication.
• Shuddering on Acceleration: If the vehicle shudders as you accelerate from a stop, it can indicate a problem with a U-joint or the center bearing.
• Difficulty Turning: In severe cases, a binding U-joint can cause resistance or a jerky feeling when making turns.

Known Issues, TSBs, and Recalls

While there are no specific recalls for the rear drive shaft on the 2016-2020 Buick Envision, GM has issued Technical Service Bulletins (TSBs) for related drivetrain components that can sometimes be misdiagnosed as drive shaft issues:

• TSB 20-NA-210: For some 2020 models, this bulletin addresses a software issue in the Rear Differential Clutch Control Module that could cause "Service All-Wheel Drive" messages. While not a drive shaft fault, it relates to the AWD system's operation.
• TSB 18-NA-049: This bulletin applies to other GM SUVs with similar AWD systems and addresses clunking or growling noises from the rear, potentially caused by corrosion or leaks at the rear differential. These sounds could be mistaken for a bad drive shaft.

Overall, the drive shaft on the Envision appears to be a reliable component with no widespread, documented failure patterns. Most issues arise from normal wear and tear on the U-joints and center bearing, or from physical damage to the shaft itself.

Buying a Used 2016-2020 Envision Rear Drive Shaft

A used OEM drive shaft is often a smart choice over a new, cheap aftermarket part, as OEM shafts are built to high standards for balance and durability. However, a thorough inspection is crucial before purchasing.

Inspection Checklist:

1. Check the Universal Joints (U-Joints): Hold the yoke on one side of the U-joint and the shaft on the other. Try to twist and move it. There should be no play, looseness, or gritty feeling. The movement should be smooth and tight. Any binding or notchiness means the U-joint is bad.
2. Inspect the Center Support Bearing: The drive shaft is a two-piece unit with a support bearing in the middle. Check the rubber surrounding the bearing for any tears, cracks, or signs of dry rot. The bearing itself should spin freely without noise or roughness.
3. Examine the Shaft for Damage: Look down the entire length of the shaft. Reject any shaft that has significant dents, deep gouges, or any signs of being bent. A damaged shaft will be impossible to balance and will cause severe vibrations.
4. Look for Missing Balance Weights: You will see small metal squares welded to the shaft. These are factory balance weights. If you see a spot where a weight has clearly fallen off (a clean spot or leftover weld marks), the shaft will be out of balance.
5. Verify Part Numbers: Check the part number on the shaft against the known OEM numbers to ensure compatibility.

Cost Comparison

Prices can vary based on supplier and location. These are estimates to help understand the value of a used OEM part.

Replacement Overview & Difficulty

Replacing the rear drive shaft is a moderately difficult job that is feasible for a DIY mechanic with the right tools and safety equipment.

• Difficulty Rating: 3 out of 5
• Estimated Time: 1.5 - 2.5 hours
• Tools Required: Ratchet and socket set (15mm is common for GM), torque wrench, jack and jack stands, pry bar, thread locker.

General Steps:

1. Safely raise and support the vehicle on jack stands. The vehicle must be in neutral to rotate the shaft for access to all bolts, so ensure the wheels are chocked securely.
2. Unbolt the rear of the drive shaft from the differential flange. There are typically four 15mm bolts. You may need to rotate the shaft to access them all.
3. Unbolt the two bolts holding the center support bearing to the vehicle's underbody.
4. With the shaft supported, slide the front yoke out of the transfer case. Be prepared for a small amount of fluid to leak out.
5. Installation is the reverse of removal. 🎬 Watch this step-by-step drive shaft replacement on a Buick SUV Apply thread locker to the flange bolts and torque them to factory specifications in a cross pattern.

OEM Part Numbers

The following OEM part numbers are known to fit 2016-2020 Buick Envision AWD models. Parts may be superseded over time, so always verify fitment with the seller.

Frequently Asked Questions (FAQ)