Should shake or shimmy on acceleration, may also squeak and clunk.
probably a universal joint. Or a cv joint depending on what is applicable to your car
when you change directions from forward to reverse it makes a clunk sound and there is a slit delay in movement.
yes it is on the top part .. one bolt holds it in very center top you have to reach over to feel it
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It will probably start out as a rotating squeak then when it gets worse you will hear a loud clink going from drive to reverse or reverse to drive. In it's final stages you will feel a vibration also.
In the first stage you may hear a rotating squeak when accelerating. As the joint deteriorates you may hear clinking and snapping sounds when putting vehicle in drive and accelerating, then you may also feel vibrations at certain speeds. The last sound you will hear is when the driveshaft falls off in the road.
hopeful
like your flying!
treasonis
The most common cause of banging from the rear end of a rear wheel drive vehicle when accelerating and decelerating are worn out universal joints on the drive shaft. Universal joints consist of two yokes (they are in a "U" shape), a center trunnion or spider, a grease fitting (also known as a zerk), four needle bearing caps, two snap rings, and two retaining brackets with two bolts each. Your F-150 also comes with what is called a double cardan joint which is basically two universal joints with a ball and socket joint in between them. If any of these joints wear out, they allow a little bit of play which results in a lot of bang when a lot of torque is applied or released from the drive shaft. Below is a link to a picture of a Universal Joint as well as some instructions on how to replace them. Below is a link to a picture of a double cardan joint with some instructions to change them out as well. You can test the joints yourself before spending time or money replacing them. If you have a jack, block the front tires from rolling either direction and then lift the back end off the ground (even one tire will work). Put your truck in neutral and then lie down under the back of your vehicle. The drive shaft extends from the transfer case to the rear differential (the bigger round part on the rear axle) and it should have a double cardan joint next to the transfer case and a universal joint closer to the differential. You should test both of these joints by placing one hand on either side of one of the joints and twisting in opposite directions. Twist as hard as you can, but you shouldn't be able to feel any free play in the joint. If there is, the joints need to be replaced. The joints aren't very expensive for just the part so if you have the mechanical experience, it might be in your best interest to replace them yourself. I bought some for a customer's jeep yesterday and they came to 12.99 per universal joint. The expense will come from labor costs from the mechanic. If you aren't able to feel any play in the universal joints, there is a possibility of excessive backlash in between the ring and pinion gear inside your differential. There is also the possibility that the slip joint on the front of your drive shaft is worn out too. Just a side thought.
If your Jeep is lifted, bad driveline angles could be causing the vibrations.
The PO442, if I'm not mistaken..is the code I was getting for an "Emissions Leak"-small.. sometimes caused by the gas cap, but mine was a leaking "vacuum type hose" located back at the gas tank.. finally found it, by having Jeep running and got under the back of the Jeep, I could hear it, right above the gas tank.. reached up and touched and could feel and hear it " HISS" even more.. hope this helps you.