2011-2012 BMW 740i & 740Li Rear Drive Shaft: Solving Fitment and Failure
This guide decodes the critical differences between the short and long wheelbase models and explains how to diagnose common drive shaft failures.
- The most critical factor is wheelbase: 740i (short) and 740Li (long) use different, non-interchangeable drive shafts.
- Common failure points are the rubber giubo (flex disc) and the center support bearing, which cause vibrations and clunking noises.
- A recall (NHTSA 17V067000) was issued for the rear CV joint on some 2012 models, which could break and cause a loss of power.
- When buying used, thoroughly inspect the giubo for cracks and the center support bearing for tears or sagging, as these are the most likely components to fail.
Critical Compatibility: 740i (Short Wheelbase) vs. 740Li (Long Wheelbase)
Warning: The single most important factor when purchasing a rear drive shaft for a 2011-2012 BMW 7-Series is the vehicle's wheelbase. The standard 740i (F01 chassis) and the long wheelbase 740Li (F02 chassis) use different length drive shafts. They are not interchangeable.
The 740Li has a longer wheelbase (the distance between the front and rear wheels) by about 5.5 inches, requiring a significantly longer drive shaft. Installing the wrong shaft will make it impossible to connect the drivetrain components and can cause severe damage if attempted.
- Standard Wheelbase (SWB) 740i (F01): Uses a drive shaft measuring approximately 1729mm (about 68.1 inches). The primary OEM part number is 26107614652, which supersedes 26107562803.
- Long Wheelbase (LWB) 740Li (F02): Uses a drive shaft measuring approximately 68.75 inches (about 1746mm). The primary OEM part number is 26107614653.
Always verify your vehicle's model (740i vs. 740Li) or confirm the part number from your old drive shaft before purchasing a replacement.
Symptoms of a Failing Rear Drive Shaft
Drive shaft failures on these models typically originate from one of three components: the giubo (flex disc), the center support bearing, or the rear CV joint. The symptoms often provide clues to the specific point of failure.
1. Vibrations Under Acceleration
A vibration that starts or worsens during acceleration is a classic sign of a failing drive shaft component. The vibration is often felt through the floor or seats, originating from the center of the car. This is frequently caused by tiny cracks or deterioration in the rubber giubo or a sagging center support bearing, which throws the rotating shaft slightly off-balance.
2. Clunking or Thumping Noises
A distinct "clunk" or "thump" when shifting from Park into Drive or Reverse often points to a worn-out giubo. The noise is the sound of slack in the driveline being taken up abruptly. As the rubber in the giubo degrades, it can no longer effectively dampen these movements, resulting in metal-on-metal contact or excessive movement.
3. Howling, Squealing, or Grinding Sounds
A continuous howling, squealing, or grinding noise from underneath the car that changes with vehicle speed is a strong indicator of a failing center support bearing. As the bearing inside the rubber support wears out, it loses its lubrication and begins to make noise. This sound will typically increase in pitch and volume as you drive faster.
4. Shuddering from a Stop
A noticeable shudder or jolt as you pull away from a complete stop can be caused by a failing center support bearing. The worn rubber support allows the drive shaft to move excessively, causing a brief but jarring shudder as the drivetrain engages.
Pro Tip: Sometimes, a failing rear CV joint can mimic these symptoms. A recall was issued for some 2012 740i and 740Li models for a CV joint that could break, leading to a loss of power. While the recall addressed a specific manufacturing defect, it's wise to inspect the CV joint for any play or grease leaks during diagnosis.
Buying a Used Drive Shaft: What to Inspect
A high-quality, low-mileage used OEM drive shaft is often a superior choice to a cheap, new aftermarket unit because OEM shafts are precision-balanced at the factory to prevent vibrations. However, a thorough inspection is critical before you buy.
- Inspect the Giubo (Flex Disc): This is the most common failure point. Look for any cracks, even hairline ones, in the rubber between the bolt holes. Bend the disc slightly to expose hidden cracks. The rubber should be firm, not soft, mushy, or oil-soaked.
- Inspect the Center Support Bearing (CSB): Check the rubber support surrounding the bearing for any tears or sagging. The rubber should hold the bearing firmly in the center of the metal carrier. Try to spin the bearing by hand; it should turn smoothly with some resistance. A bearing that spins too freely or feels gritty is worn out.
- Check the Universal Joints (U-Joints) and CV Joint: Hold the shaft on either side of a joint and try to twist it. There should be no play or clunking. The joints should pivot smoothly in all directions without binding. On BMWs, the U-joints are typically not serviceable separately, so a bad joint requires replacing the entire shaft or seeking specialized remanufacturing.
- Verify the Part Number and Length: Double-check that the part number stamped on the shaft matches what you need for your 740i or 740Li. If the number is unreadable, measure the total length from flange to flange and compare it to the specifications.
- Look for Damage: Inspect the shaft tube for any dents, dings, or deep scrapes. A dent can throw the shaft out of balance and cause vibrations that are impossible to fix. Check that the balancing weights are still welded in place.
Known Issues, TSBs, and Recalls
NHTSA Recall 17V067000: BMW issued a recall for certain 2012 BMW 740i and 740Li vehicles due to a rear driveshaft constant velocity (CV) joint that could fatigue and break. A failure would result in a complete loss of propulsion. The remedy was for dealers to inspect the CV joint and, depending on its production date, replace it free of charge. Owners may hear a noise from the joint area, followed by a vibration, as it begins to fail.
There are no widely published Technical Service Bulletins (TSBs) for other common drive shaft issues like giubo or center bearing failure, as these are generally considered wear-and-tear items. However, their failure is a well-documented occurrence on many BMW platforms of this era.
Cost Comparison
| Part Type | Estimated Cost |
|---|---|
| New OEM | $1,100 - $1,900 |
| New Aftermarket | $350 - $600 |
| Used OEM | $150 - $350 |
| Remanufactured | $600 - $900 |
| Shop Labor | $250 - $450 |
Frequently Asked Questions (FAQ)
Can I just replace the giubo or center support bearing instead of the whole drive shaft?
Yes, the giubo and center support bearing are available as separate parts and can be replaced independently. This is a common and cost-effective repair if the rest of the drive shaft (U-joints, CV joint, and shaft tube) is in good condition. However, it requires specialized tools to separate the two halves of the drive shaft to replace the center bearing.
Is a vibration while driving always from the drive shaft?
No. While the drive shaft is a common cause, vibrations can also come from unbalanced wheels, bent rims, worn suspension components, or even out-of-round tires. A key difference is that drive shaft vibrations are often related to acceleration and may be felt in the center of the car, while wheel-related vibrations are usually felt in the steering wheel and occur at specific speeds regardless of acceleration.
How do I know for sure if I have a 740i or 740Li?
The easiest way is to look at the badge on the trunk lid, which will say either "740i" or "740Li". You can also check the vehicle information label on the driver's side door jamb. The 740Li is noticeably longer, with most of the extra length visible in the longer rear doors.
Is replacing the drive shaft a DIY job?
For an experienced DIY mechanic, this is a manageable job, but it is involved. It requires safely lifting and supporting the vehicle, removing sections of the exhaust and heat shields, and having the correct tools, including E-Torx sockets. The components are heavy and must be torqued to specific values. For most people, this job is best left to a professional.
Technical Specifications
OEM Part Numbers: 26107562803 26107614652 26107614653 26117562810 7562803 7614652
Approximate Length for 740i (SWB): 1729mm. Approximate Length for 740Li (LWB): 1746mm (68.75 inches).
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- BMW 740i:
- Critical Compatibility: 740i (Short Wheelbase) vs. 740Li (Long Wheelbase)
- Symptoms of a Failing Rear Drive Shaft
- 1. Vibrations Under Acceleration
- 2. Clunking or Thumping Noises
- 3. Howling, Squealing, or Grinding Sounds
- 4. Shuddering from a Stop
- Buying a Used Drive Shaft: What to Inspect
- Known Issues, TSBs, and Recalls
- Cost Comparison
- Frequently Asked Questions (FAQ)
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