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Servicing MOOG Compression Loaded Ball Joints
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By Counterman
MOOG recently announced the launch of its new line of Constant Velocity (CV) Axles. A news release explained that MOOG’s CV axles are engineered with high-quality materials and undergo rigorous testing to ensure a precise fit across various vehicle models. These CV axles feature neoprene boots that help prevent dirt and moisture intrusion, heat-treated components for increased strength, and high-quality grease to provide optimal lubrication.
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link hidden, please login to view CV Axles represent MOOG’s commitment to providing problem-solving solutions,” said Thomas Galla, senior product manager at DRiV. “Our technician focus inspired the product design to be easy to install with an axle nut and inboard bolts included in each kit (where required), making vehicle maintenance a hassle-free experience.” The new CV Axles are compatible with a range of vehicle models. Notable compatible vehicles include the 2007-2020 Cadillac Escalade ESV (Front) with part number 10H002, boasting a vehicle in operation (VIO) of 9,710,288; the 2003-2009 Lexus GX470 (Front) with part number 14H002, which has a VIO of 4,998,289; and the 2002-2006 Chevrolet Avalanche 1500 (Front) featuring part number 10H001 and a VIO of 6,233,229.
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By Counterman
While constant velocity (CV) joints are the most popular type of driveline joint in use today, universal or “U” joints are still in use on the driveshaft of many larger SUVs, trucks and vans. U-joints can handle a lot of torque, making them popular for these applications, but why did the CV joint rise in popularity? The question can be answered by looking at the operational aspects of a U-joint.
The basics are this: U-joints are located on the ends of a driveshaft, mounted between the driveshaft and a front and rear yoke. The front yoke attaches to the transmission and the rear yoke attaches to rear differential. As the engine moves from the effects of torque and as the suspension of a vehicle travels up and down, the angle of the driveshaft changes.
A U-joint does two things. First, it transfers the motion between the yoke(s) and driveshaft and, second, it does this at different angles, allowing for driveline movement. Here’s where the fun begins. When a yoke and the driveshaft are in perfect alignment, the velocity from one is transferred to the other at the same rate. However, when there is an angle between the two, the velocity of the driven member fluctuates continuously during rotation.
It can be hard to visualize, but the reason this happens is that as the angle of the U-joint changes, the two halves of the U-joint cross are forced to rotate on a different axis. The drive axis remains at a constant velocity, and the ends of the U-joint connected to it rotate in a consistent circular path at the same velocity.
The driven axis, however, rotates in a path which causes the distance of travel at the outer ends of the U-joint cross to increase or decrease in relation to the consistent points of the drive axis.
This effect results in the continuous fluctuation of velocity between the input and output sides of the U-joint. While the input remains at a consistent speed, the output speeds up and slows down as the points of the driven axis continuously alter between a long and short path of travel.
So, why don’t we feel that on a vehicle with a traditional driveshaft? Because there are two U-joints and the fluctuation on each end balances out, effectively allowing the driveshaft to provide a consistent output speed to the rear differential. The angle of the two joints must be the same, however, and it doesn’t take much wear in one for the angles to differ, and subsequently cause a vibration.
U-joints are known for their propensity to cause vibration, and an inherent disadvantage they have is the greater the angle of the U-joint, the greater the fluctuation in velocity. Anything over 30 degrees and the fluctuation dramatically increases.
The driveshaft I’ve described here represents the majority, but U-joints have also been used frequently in the past on the end of the front axles for a 4WD vehicle, and in the rear of independent rear suspension vehicles on the ends of short driveshafts, known as half-shafts. Have you ever noticed how jittery an old 4WD truck feels in the front when the hubs are locked, and you turn a corner? Now that you understand how the fluctuation in velocity of a U-joint changes as the angle increases, you know why.
You may have heard of a Double-Cardan U-joint. It is basically two joints side-by side with a common link-yoke in between. This is one of the original concepts for a true CV joint, and they are often referred to as this. The advantage they have is they offer smoother operation at greater angles, and they are common on 4WD trucks, and a common upgrade for lifted trucks where the driveshaft angle is altered considerably.
The drawback to a Double-Cardan joint is they are bulky, and they can still suffer from limitations due to operating angle. The operating limitations of a U-joint ultimately brought about the popularity of the modern CV joint, but the durability of U-joints means we’ll still be seeing them in certain applications.
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By Counterman
link hidden, please login to viewof Louisville, Kentucky, has officially joined forces with link hidden, please login to view. The transaction was finalized on August 1, 2024. Doug Washbish, president & CEO of Moog Louisville Warehouse, will join the Auto-Wares Board of Directors and Executive Leadership team. In a news release announcing the transaction, Auto-Wares called the partnership “a significant milestone for both organizations, aiming to capitalize on their combined strengths for future growth and innovation.” “I am most excited to announce that Moog Louisville Warehouse and its Bumper to Bumper stores have joined forces with
link hidden, please login to view,” said Washbish. “I’ve had the benefit of working with and sharing ideas with the team at Auto-Wares for some 25+ years, as a member of the Aftermarket Auto Parts Alliance. There is no group of stores in the country that better shares the same ‘go to market strategy’ that has defined our company for 60+ years, other than Auto-Wares! Their honesty and integrity in everything they do is a perfect blend for our WORK HARD and BE NICE philosophy we practice. I am pleased to say I will continue to maintain a meaningful equity position of the overall company and will continue to run Moog Louisville with our current management and personnel that have made our company the leader in our region!” “We are thrilled to welcome the Moog Louisville Warehouse, Doug Washbish and his excellent team to the Auto-Wares family,” said Todd Leimenstoll, president & CEO of Auto-Wares Group of Companies. “This partnership aligns perfectly with Auto-Wares’ strategic goal of expanding our geographic footprint and market density. Doug’s leadership and expertise will be invaluable as we move forward.”
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By Dorman Products
Swapping a knuckle or replacing a bearing? Loaded knuckles are the DIYers best friend
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By Garage Gurus
If you suspect that your vehicle's engine is losing pressure in a cylinder, it can be helpful to perform a relative compression test to ...
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