Alright so while re-doing some diagnosing tonight, jacked up front left pulled abs fuses and spun it up to 50 there was the vibration. did right side next and there it was vibration and horrible noise coming from under truck. I just knew it was going to be the transmission and I promise you the truck would have "caught fire" tonight. Jacked up back triple supported it and chocked front and back of every other tire, spun it up to 50 and no vibration or noise..

That rules out the transmission and means its in the front of the transfercase, i think spike was right.

BUT there is NO play at the front output shaft, others with cracked output bearings have little vibration and alot of play. I have a tone of vibration and a no play. I dont see how something so small can make so much vibration.. but it is.. Doesn't matter Im replacing center diff with a locking one!

 

Great diagnosis.
If not a bit brave and hazardous.

Running the transfer case with the back stationary and the fronts or a front wheel spinning is not a normal mode.

So, you'll have the transfer case power splitting and winding up a gear in there.
You'll have the diff also cranking the spider gears.

Wonder if you can get all 4 wheels off the ground and run it that way?

I would not want to get under it running like that.
But.. Thinking.

While this is up and all 4 wheels are free to turn and it is running at 50mph..

One could get a stiff rod - like a long curtain rod and hold it against the transfer case and feel if there is lateral vibration in the rod - from the transfer case to your hand.
Then hold it against the diff.

If it is the drive shaft, then the vibration will either shake the diff at one end or the transfer case at the other or maybe both.

Painful to figure out.

If fact, if you took off the wheels, that gets rid of the unbalanced tires factor.

saw on another forum - putting a hose clamp onto a drive shaft.
The screw that holds the clamp and provides the clamping force is the balance weight.
This is then moved around the drive shaft to improve the balance until the heavy spot is found. The heavy spot will be a 180 degree away from the heavy spot of the hose clamp.
Sometimes simple wins.
Maybe I'll try that some day on my discovery II. As it will not literally kill me to do it.

 

Instructions

1.  
   • 1 Put the car on a lift and support the rear axle so the rear wheels can freely rotate. Place the car in neutral and release the parking brake.
     
     
   • 2 Take off the rear wheels, then install lug nuts so the flat sides are against the brake drums.
     
     
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   • 3 Get an assistant to sit in the driver's seat. Lift the vehicle, making sure to set the lift's lock.
     
     
   • 4 Ask your assistant to start the engine and to drive in high gear to a speed of approximately 40 to 50 mph. Do not run for long periods or faster than 55 mph since this can cause damage to the engine or transmission because there is no load.
     
     
   • 5 Raise your chalk near the drive shaft's rear, using a stand for support. Raise it until you make contact with the rotating shaft. The mark shows the location of the shaft's heavy spot.
     
     
   • 6 Ask your assistant to step on the brakes gently, then turn the engine off.
     
     
   • 7 Install two hose clamps side by side onto the drive shaft, aligning the screw assembly 180 degrees opposite the chalk mark.
     
     
   • 8 Tighten the clamps. Ask your assistant to turn the engine on again and accelerate to 40 to 50 mph. If you detect no vibration, replace the wheels, lower the vehicle and take it on the road for a test. If you detect vibration, equally rotate the two clamps away from each other the same amount. Tighten the clamps and continue tightening until you detect no vibration. When you feel no vibration, replace the wheels, and lower the vehicle for a road test.
     
     

 

Hey thanks for replying! I will jack up All 4 wheels and remove the tires can't hurt but, it's acceleration that causesi it a load of some type so it can't be just a wheel un balanced or a brake rubbing..

Ill Jack up All 4 but that's what the shop did and couldn't find anything.

But if I hear/feel it in The front only.... It's the front..

I know it's not the driveshaft by now, there is no movement to it and its the third one that has been on this truck. But maybe ill give it a shot

 

Spencer,
Hats off to you.
You are a hardworking guy.
Let us know what you find...

Mine has a vibration too.
at 67 to 75 MPH I am really worried as the vibration is intense.
So, I am watching you to see what you find..

I don't have a garage to work on it and our weather in Seattle will be going to crap soon.

I don't drive my D2 much.
It did start today and I drove it two miles to a coffee shop.

 

Yeah, you gotta get into it and rev it and feel carefully for a vibration.
I would think - the masses will vibrate loaded or unloaded.

With a load on a shaft - a bearing will load differently.

 

Have fun reading, pics too.

https://landroverforums.com/forum/di...ati%F3n-21034/