Change the U-joints on the rear drive shaft. They don't have to move to be bad. The bearing in the joints are rusted. Be sure to mark the yolks on your drive shaft and rear diff pinion. They are ballanced are must go back in the same way you took them apart.
With that being said, did you drop the shaft an dnot put it back in the right way? that will cause a vibration. Also, have you checked to see if there is any play in your pinion shaft?
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Have you had your tires balanced? have you had an alignment? do you have any broken suspension parts front or rear? Is your drive shaft bent? balanced? What makes you think changing differential assemblies will stop the 'shaking'?
Well, I can think of a couple of things. Number 1, are you sure the noise isn't comming from your rear diff. The independent rear end isn't as strong as the solid 8.8 axles of the older mountaineers. The toe links go out, and it causes the axles seals and rear bearings to go out. However, in this case I would look at the axle seals going into your rear diff. carrier. If it looks like your leaking, you could be blowing out the limited slip diff in the rear end. That would make a whining noise, and a lack of power because of the diff spinning instead of the tires. Now as for the transmission, that could be bad news. Ford does have a TSB for one of the internal parts wearing a groove in the casing. If I remember correctly it is one of the shift solinoids. That could be another cause the truck itself not going into gear. On the other hand some of the older Explorers had problems with the valve body gasket and that can do the same thing. So you may want to just change the valve body gasket and see if that fixes the problem before you have your whole trans remained. I know I threw a lot at you, especially with that added stuff about the rear end issues, but that is all items you might want to check.
remove the drain plugs from the diff units and check for metal bits. Check for metal in the transfer case oil as it sounds like a bearing in the diff section of the transfer case has failed.. There is a small diff here to allow the front wheels to travel at a different speed to the rear unit to allow for driving over un even surfaces or speed bumps.
cupped tires can make noise rotate them to the front to see if the problem goes with the tires they do have wheel bearings that go bad and the rear diff but the rear diff will change noise when your on and off the gas
I had a 4x4 year ago. Do you have front locking hubs ? I don't think so if you did I would ask if they were in or out. If there is nothing else It has to be coming from the transfer case. As far as I know no manufacture makes a true 4 wheel drive but Jeep except for maybe Raptor or Power Wagon. Most come with an open diff in the rear one wheel drive unless you order it special and the front you can't even order a locker if you wanted to 99.+% of 4x4s have open diffs in the front. Jack up one front wheel and one rear wheel if you didn't order a special rear end if you try to drive off the jacks you will sit there and spin your 2 wheel drive and not move.Ford says if you have worn tires or not the same air pressure in all tires it will do this. I think you have a bad u joint or pieces broken in the transfer case or it is out of adjustment. Jack car up like I said before and when the wheels spin without pulling it off the jack stands crawl under and see where the noise is coming from front or transfer case.I wonder if your shift motor could be bad they are about 65 dollars
4 wheel drive trucks make this sound alot im guessing its a manual shift so i would saw that the meshing is more of a grinding instead so i would have the transmission rebuilt to fix the problem or just see if the rings inside the trans. is missing the tooths on it :)
The 99 Jeep Grand Cherokee was prone to bad diff bearings because they
changed the plant where they were made. The new plant used inferior
materials. The only way to fix it is to replace and set the diff
many things, first check the vacuum hoses underneath the batery rack to make sure there are no kinks, if thats ok, check the oil levels in both the transfer case and front diff, if that's ok, you'll have to check the fork system on the front diff, and also something real stupid put ignition on shift to neutral and press 4 low then 4 hi and see what it does, if stuck in 4 low it will make like a clutch slipping sound but i've seen it stuck and make no noise cause you really have to go through neutral to in and out of 4 low.... good luck