As soon as start to drive I feel some hesitation and a noise as if something is stuck somewhere. I think it comes from a U Joint between the two shafts underneath. Anyone with any suggestions
CV joint could be broken.
Here's the u-joint.
SOURCE: Transmission 1993 Ford Aerostar
it sounds like one of two things the knuckels in the cv axle are gone. and or you parking pin is been shered off. In result try getting a new cv axle.
SOURCE: Vibration at Speed.
i still think universal join in drive shaft is dead or could also be the bearing inside deferential or transy ...
do you hear a funny noise or some thing unusual?
SOURCE: 2004 ford f150 4x2 4.6 drive shaft has vibration
check the U-joints by grabbing the drive shaft and try to make it move from side to side or top to bottom.It is much easier to do this if the vehicle is in the air and no weight on the axle.If it does move replace that U-joint,but if you are going to replace one then I would do both since you will have the drive shaft out any way.Also check to see if the shaft weight is still there,but I doubt it has came off its pretty rare.
SOURCE: 2004 ford expedition.4x4 eddie bauer.
Hello, I noticed one thing in your statement about the noise easing off at 40MPH. Thats about the time your overdrive kicks in and the engine RPM drops down. With the other noises like tire and wind noise increasing above 40MPH it could mask the remaining noise from the drivetrain. And like you said, a seat of the pants vibration remains.
When you said you checked the U-joints on the driveshafts, did you remove the front driveshaft to do it? If you were to remove the front driveshaft you could also tell whether the problem includes the front Differential by driving the truck without the front driveshaft. I have had a few clients with seized front U-joints which did not reveal themselves until the shaft was dropped.
Sometimes its the simple things that bite you. Did you check the Lube in the axles and Transfer case? A stuck Servo in the Transfer case could occur. As I understand, the newer types use Resistors in the Selector switch and feed into a single wire to the servo. You might disconnect the wire and check for 3 distinct Voltages as the Selector is turned. It could be this whole problem is Electrical instead of mechanical.
I do not have the Electric values for your Selector, but the F150 forum and the FourWheeling forums have good information and online help. A simple Web search for these numbers will turn them up, that is where I came across them on a Web search for a problem.
I hope my solutions will be helpful to you and I would like to know the outcome on your problem. I may be able to help someone else later on.
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