drive train vibration on deceleration

[nh98gsx]

i have searched on this and no one really has said what the problem is. But whats happening is mostly in 4th and 5th gear when at cruising speed and i let off the gas then just feather the gas to decelerate slightly i m getting a viberation from under the car. I just had all the rotors turned w/new pads. I checked the movement of the propeller shaft into the rear diff and their is no movement, I shook the drive shaft at the lobro joints and their is only about 2mm of movement in any direction.
Does any one know what this might be?

 

[nh98gsx]

would a going clutch cause this, the sound seems as if it is coming from the rear?

 

[Willjs7]

That is Your transfer case. Im 90% sure of it. Read up on it. Search

 

[nh98gsx]

is there any way to check the t-case, without pulling it off to see if it is going, also how about the rear axles is there any way to check them with out pulling them to see if there is anything wrong?

 

[nh98gsx]

driving home tonite i noticed that it was mostly in 4th gear at 2500 rpms. someone else has to have had this problem and figured out what the freak it was.

 

[Willjs7]

Check your transfer case fluid.

 

[nh98gsx]

i have just went over to red line 75w-90 and the noise is still there. and i have double checked the level, one of the first things i thought of as well.