I've been trying t find the source of a jiggle/vibration /wobble in my 98 disco off and on for a couple of months. Looked at my rims- then my u joints and replaced the rear u joints with no improvement. I was looking at my front u joints and could feel the tiniest bit of play in them so I decided that if I removed the whole front prop shaft and the jiggle was eliminated, I would then know the problem was the front u joints. Hmmmm.....
I took the darn thing out without busting my knuckles and then proceeded to take the rig out for a test drive. Well... I tried to take it out for a test drive, but to my astonishment, it doesn't go anywhere. No matter what gear I put it in, it just sits.
What's up with that!!?? I know these rigs are a semi full time 4 wheel drive, but I assumed if the front prop shaft is disconnected, the tranny will still send power to the rear shaft. No!?

Is this the way the thing is made, or have I been running around with front wheel drive only?

 

Maybe it's in the steering components not the driveline. Tie rod ends, wheel bearings, or maybe even the tires.

 

Your CDL didn't get knocked into neutral, did it? You locked?

 

You have to lock your center diff !

 

if by CDL you mean the differential lock , no -it's not in neutral. In fact that's what i thought at first but I tried it in all positions. Nothing I did engaged the rear shaft. It just sits like it's in neutral. Surely this is just some magical mechanical devise that causes the rear shaft to disengage when the front shaft has no resistance??...I hope! Someone out there knows...I'm sure.
To coors- I've already checked the tie rods and tires and wheel bearings Thanks though.

 

To blamo- as I said in the last reply- I tried all positions on the diff. lock shifter. the engine's running but it ain't going nowhere. Help!

 

Power ALWAYS follows the path of least resistance, that holds true for electricity, water...if you were to have someone hold their foot on the brake, put it in gear and you stick your head underneath you would see the front output turning on the t-case.
You need to lock your t-case in hi, thats all the way towards the left side of the truck, the locked light on the dash comes on you are not locked thus the truck will not move.

 

to Spike- seriously! I put the differential lock in all 4 positions And nuetral...several times-No movement! I'm sure the front output is turning as you said but nothing going to the rear.And yes, I tried holding my foot on the brake too.

 

But unless the light comes on on the dash the CDL is not locked and the truck wont move.

 

I just went out and tried every position on the diff lock again. I can't get the blasted thing to move. Is it possible that something is terribly wrong with my transfer case and I have been running around with only front wheel drive? Could that account for the mystery jiggle/vibration?
I admit I don't understand all there is to know about full time 4 wheel drive but I thought, if anything, removing the front shaft would cause the rear shaft to get all the power. Just as if the front wheels were getting no traction. Wouldn't that cause the rear wheels to take over? What is going on here? You guys who say lock the differential-are you sure or are you guessing? No offense intended . Just wondering. Is there an answer to this?