A Practical Guide to Universal Joints for the 1960-1979 MG Midget
That clunking or vibration from under your car might be a worn U-joint; here’s how to choose the right replacement for your classic Midget.
- Your MG Midget has two universal joints on its driveshaft; it is best practice to replace both at the same time.
- Common failure symptoms include a 'clunk' when shifting, speed-dependent vibrations, and a rotational squeaking noise.
- Choose aftermarket U-joints with grease fittings (zerks) for longer service life, and consider premium brands like Dana Spicer or Moog for the best durability.
- DIY replacement is possible but requires a bench vise or press; improper installation can damage the new part.
Symptoms of a Failing U-Joint
Worn universal joints give several clear warning signs. One of the most common is a distinct "clunk" or "ping" when you shift from Park into Drive or Reverse, or when you first accelerate. This is the sound of the driveshaft taking up slack in the worn joint. Another key symptom is a vibration that you can feel through the floor of the car. This vibration typically starts at lower speeds and gets worse as you go faster. You might also hear a rhythmic squeaking noise that increases with speed, which can indicate a dry or failing U-joint bearing.
Don't Ignore the Signs
A completely failed U-joint can cause the driveshaft to disconnect from the axle or transmission. This can cause you to lose control of the vehicle and can lead to significant damage to the underside of your car.
Choosing the Right Aftermarket U-Joint
For a vehicle from this era, new OEM (Original Equipment Manufacturer) parts from British Leyland are no longer available. The good news is that the aftermarket offers a wide selection of quality replacements. Your Midget has two U-joints, and it is highly recommended to replace them both at the same time.
When shopping, you will see two main types: greaseable and sealed (non-greaseable).
- Greaseable U-Joints: These have a small nipple, called a zerk fitting, that allows you to add fresh grease periodically. This maintenance can significantly extend the life of the joint. Brands like Dana Spicer, Moog, and some GMB models offer this feature.
- Sealed U-Joints: These are lubricated for life at the factory and require no maintenance. While convenient, they cannot be re-greased if the seals fail and contamination occurs.
Pro Tip: For a classic car that may be driven enthusiastically and maintained by its owner, choosing a greaseable U-joint is almost always the better option for longevity.
Aftermarket Brand Tiers
Based on owner feedback and general industry reputation, aftermarket brands can be grouped into tiers:
- Premium (Excellent Quality): Dana Spicer and Moog are frequently cited as top-tier choices by mechanics and enthusiasts. Spicer is a well-respected OEM supplier for many manufacturers and is known for durability. Moog is also highly regarded for its quality and engineering.
- Standard (Good Quality): SKF and GMB are reliable, OEM-equivalent brands that offer a great balance of quality and price. They are a solid choice for a standard replacement.
Cost of Replacing MG Midget Universal Joints
| Item | Estimated Cost |
|---|---|
| New Aftermarket U-Joint (Set of 2) | $34 - $111 |
| Shop Labor | $200 - $450 |
| Total Estimated Cost | $234 - $561 |
Frequently Asked Questions (FAQ)
How many U-joints does my 1960-1979 MG Midget have?
All 1960-1979 MG Midgets have two universal joints on the main propshaft (driveshaft), one at the transmission end and one at the differential end.
Should I replace both U-joints at the same time?
Yes. If one U-joint has failed, the other has been subjected to the same amount of wear and is likely not far behind. Replacing both at once saves you from having to do the job again in the near future and ensures a balanced, vibration-free driveshaft.
Do I need to balance the driveshaft after replacing the U-joints?
It is good practice to have the driveshaft balanced after installing new U-joints, though it is not always strictly necessary if the job is done carefully. If you still experience vibration after the replacement, an out-of-balance driveshaft is the most likely cause.
Is replacing U-joints a difficult DIY job?
This job is possible for a skilled home mechanic, but it can be challenging without the right tools. Removing the old U-joints from the driveshaft yokes requires significant force, usually from a bench vise and sockets or a hydraulic press. If the bearing caps are not pressed in perfectly straight, the needle bearings inside can be damaged, leading to premature failure.
Technical Specifications
OEM Part Numbers: GUJ101 GUJ115 8G8186
Span Width: ~61.3mm (2.41 inches), Bearing Cap Diameter: ~23.8mm (0.938 inches). Always verify the part with your specific vehicle as variations may exist.
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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.