How To Grease U-Joints?


Before you start greasing u-joints, it’s important to ensure you have the right tools and supplies. Gather the appropriate grease, a grease gun, and a pair of latex gloves. Make sure you have an appropriate working environment with plenty of space to move around and access the u-joints you’re working on. A few rags may also be handy for wiping up any excess grease. Once you have everything gathered, you’re ready to get started.

Gather necessary tools

Before you begin, it is important to have all the tools and materials you will need close at hand. Greasing u-joints is a straightforward job requiring few tools, but having them ready beforehand will make the process quick and easy. You may need any or all of the following:

  • U-joint grease
  • Rubber gloves
  • Hand cleaner
  • Lint-free cloths
  • Towels
  • An adjustable wrench or socket set
  • A workbench or clean surface
  • A pry bar (optional)

Once you have your tools and supplies, it’s time to get started greasing your u-joints.

Read the manufacturer’s instructions

When preparing to grease the universal joint, it’s important to read the manufacturer’s instructions carefully. Universal joints should be greased with a high-quality multi-purpose grease; some manufacturers may specify a particular type of grease. Make sure you follow the manufacturer’s instructions and select a product designed for use with universal joints.

Generally, it is not recommended to mix two different kinds of grease in one application, as this may cause instability or damage to the joint. It is also important to ensure any products used are suitable for the climate and environment in which they will be used since extreme temperatures can affect grease consistency and performance.


Removing the U-joint is the first step in greasing the u-joints. You can do this by removing the bolts or clips that hold the joint in place. Once removed, the joint can be pulled from the drive shaft and set aside for further work. Check for any wear and tear on the joint before moving on to the next step.

Disconnect drive shaft

Disconnecting the drive shaft from a manual transmission is an intermediate-level auto repair task, best attempted with someone with automotive experience. Ensure you have all the necessary tools and safety equipment before you begin.

  1. Use a socket wrench to remove the six bolts that connect the transmission to the bell housing of your engine.
  2. Raise your vehicle with a hydraulic jack or lift and secure it.
  3. Remove the lower bolts which attach the cover plate of your transmission to its case.
  4. Use two separate wrenches to remove the flange bolts on either side of the drive shaft.
  5. Disconnect and carefully pull out any oil splatter shield located between it and its coupling before lifting out the drive shaft itself.
  6. Finally, clean all parts thoroughly with a damp cloth before storing them for future use.

Loosen u-joint bolts

To begin the process of greasing a U-joint, you have first properly to access the joint. Depending on your vehicle, this will mean removing a portion of the drive shaft or using a U-joint tool to access the joint.

If your drive shaft sections are connected with U-bolts, you’ll need to loosen them and ensure they are discreetly set aside so they won’t become misplaced. Ensure you note which side each U-bolt came from since they are not all typically reversible. If you’re using a u-joint tool to access the joint, be careful not to over-tighten it, as this could cause damage.

Remove u-joint

Removing a universal joint (U-joint) is a relatively simple process. U-joints are commonly found in the drive shafts of rear-wheel drive vehicles and are responsible for transmitting power from the engine to the wheels. Removing them with basic automotive tools and a few easy steps.

First, locate the u-joint in your vehicle’s drive shaft; it will typically be located at one end or the other, connected to yokes or folded pieces of metal which attach to the driveshaft. At each end of the u-joint, there will be four small studs with nuts. These nuts need to be removed to separate the end caps from the u-joint itself.

Using an appropriately sized socket wrench and socket, remove all four nuts from each end of the U-joint; you may need a large pair of channel locks as well if you have difficulty holding onto a nut while turning it off of its stud. Make sure that you keep track of each nut, as they all have different thread sizes and will need to go back on their respective studs when reassembling your U-joint later.

Once all eight nuts are removed, you should be able to slide off both end caps from their respective sides of the U-Joint and set them aside for later installation when replacing your new U-Joint assembly. With both ends free from their connections, you can now remove your old U Joint fully from its place inside your vehicle’s driveline assembly.


Before you grease the u-joints on your vehicle, it’s essential to clean them first. Using a wire brush or grinder, you can remove any accumulated rust and dirt. Use an air compressor to blow off any excess dirt, ensuring that the u-joints are clean and free of debris before you begin greasing them.

Clean u-joint and bolts

The first step to greasing u-joints is to clean them properly. First, use a brush and put some degreaser on the brush to remove any dirt or caked-on debris. Make sure you coat both sides of the U-joint with the degreaser and scrub until both the joint and any bolts are clean.

Once you are satisfied that they are both clean, rinse off the excess detergent and dry completely with a lint-free cloth. This will make it easier to apply grease in the next steps and help prevent contamination from dust or excess material from other parts.

Clean the inside of the drive shaft

It is important to clean the inside of the drive shaft before applying new grease. The straight-sided walls inside the tubes can harbor dirt and other debris that may get in the way of proper lubrication.

The most effective way to clean the interior of your drive shaft is to use compressed air. This can provide enough pressure to force out dust and other particles without damaging the walls of the tube.

If you don’t have access to a compressor, you can use a wire brush or shop vacuum to remove loose dirt and debris from within the tubes. Alternatively, you may want to try using solvent-based cleaners, like degreasers, which are designed specifically for this cleaning job. Be sure to let them sit for several minutes after application so they have time to break down any heavy buildup or grime. Finally, make sure that you rinse away all solvent residue with a warm towel before applying the new grease.


Greasing your u-joints is one of the most important maintenance tasks for your vehicle. Properly greasing your u-joints will help ensure that your vehicle is running smoothly and efficiently.

In this section, we’ll discuss the following:

  • Why greasing your u-joints is important.
  • How to do it correctly.
  • The best type of grease to use.

Apply grease to ujoint

The universal joint, often abbreviated as the u-joint, allows power transfer to occur between multiple different angles on a powered device. Commonly found in automotive drivetrains and other moving machinery, universal joints use bearing cups held with a cross-shaped coupling that lets the joint flex so it can transmit torque. The bearings within this coupling require adequate grease to ensure that they stay properly lubricated and don’t become damaged over time.

To apply grease to the u-joint, you’ll need a light gauge gun with a soft-bristled brush attachment or an old rag for smearing the lubricant onto the surface. Make sure that your chosen grease is designed for use on u-joints, as some types of lubricant may cause damage or reduce their lifespan. Applying too much grease is also something you should avoid; it’s important to get just enough so that you can see some movement from the bearings when you manually rotate them but still not enough to cause excess build-up anyplace else on your system.

Once you have applied the appropriate amount of grease, use a simple paper towel looped through each bearing cup and spin it around in circles until new grease comes out at each point – this will indicate even coverage and proper application of your chosen lubricant. Remember to monitor your u-joints to maintain peak condition and replace them at regular intervals if needed.

Reinstall u-joint

To reinstall the u-joint, the caps must be reattached to their respective yokes. Submerge the cap and its corresponding yoke in a bath of fresh grease, submerging it fully. This will ensure that the u-joint is properly lubricated once it is installed. Take special care not to lose any of the needles inside the u-joint from the caps being submerged, as these are hollow.

Once all parts are greased, align them for installation and compress them firmly back into place with your press until both caps fit snugly in their respective yokes and are secured with new C clips, if applicable. Once installed, wipe away any excess grease from both surrounding areas on each side of the joint and inspect this area for any signs of leaking or spilling during installation. If no damage occurs during assembly, you have successfully greased and reinstalled your u-joints!

Tighten bolts

When greasing, the first step is to ensure all bolts are properly tightened. Depending on the bolt type, this can be accomplished by tightening it until it can only move a certain amount or until the head of the bolt is as tight as possible against its companion surface. Make sure to use the correct socket or wrench size for your bolts, and use a torque wrench if torque values are specified. For extremely tight, stuck, or corroded nuts and bolts, heating may need to be employed before removal.

After tightening each joint component properly with the appropriate tools, apply a thin coat of grease over the threads, then reinstall them with any required washers or seals. It is important to note that some bolts are designed without lubrication and should not be greased; use caution when selecting what types of fasteners should receive grease and that no excess should remain visible on their surface after being lubricated.


Before greasing a u-joint, it is important to test the u-joint for any wear or damage. Testing is the first step to make sure that the u-joint is in good condition and that it can be safely greased.

It is important to inspect the u-joint for any cracks or signs of abnormal wear. Also, look for signs of rust or corrosion indicating that the u-joint needs to be replaced.

This section will cover the steps you should take to test a u-joint before greasing it:

Reconnect drive shaft

To reconnect the drive shaft, you’ll need to hold the axle and transmission sides of the drive shaft steady with one hand while threading the U-joint caps with the other. Be sure to use a light coating of grease or molybdenum disulfide (Moly or MoS2) on each cap for smooth operation and longer wear.

  1. Insert the cross into one side of the U-joint, and twist it in gently but firmly until it snaps into place.
  2. Repeat with the other side in a similar order, then carefully line up both halves to meet evenly.
  3. Thread each cap securely into place using your fingers.
  4. Give each cap a few turns using an adjustable wrench, and then use an open-end wrench to ensure they’re tight.

Reconnecting your drive shaft is a necessary first step when tackling any U-joint job. It requires careful attention to detail to ensure that your joints remain secure and properly lubricated throughout their life expectancy.

Test for proper operation

Once your new u-joints have been installed, it is important to ensure proper operation by checking for any issues. This should include testing for resistance when rotating the input shaft and output shaft, as well as looking for signs of binding or drag that could indicate problems with the installation.

When testing the u-joints, use a light lubricant to ensure that the components are properly lubricated and operate smoothly when driven at low speeds. Grease drums, automotive grease guns, or aerosol spray can apply grease during testing. Make sure you fill all of the voids in the assembly fully with grease to lubricate all moving parts before driving at higher speeds.

It is also important to regularly check the function of these components after they have been installed by inspecting them visually at regular intervals or listening for any unusual noises during operation. You should also test these components annually after they have been replaced to maintain their performance and longevity.

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