Unballanced drive train

[Fishermuskie]

Hello Folks,

I have a vibration in the drive train on my 2000 Explorer from about 30 mph thru top speed. I have replaced the Insulator, a rubber and steel mounting bracket that mounts to the cross frame and to the transmission this helped reduce the vibration but didn't resolve my problem. I have looked at the u-joints and they are not loosing any grease and are not wobbleing sp?

The problem started a couple weeks ago when I put my boat on 4" blocks for storing for winter, I backed up to the blocks and shifted to 4 wheel low and did sort of a brake stand to get the boat to jump up onto the blocks in reverse. Could I have twisted the drive shaft when i put the boat on blocks?

I have one other question, Does the front drive shaft for the 4 wheel drive rotate when it is not engaged? During normal driving?

Thanks for any help with this issue.
Good Luck,
Dave

[denisb]

I can't see twisting the drive shaft. How often do you use your 4X4? could be that your front drive got stuck and not dissengaging properly/completely.

[TeamExploder]

Agree with the person above, try and tap on the t-case/t-case motor with a hammer, this often helps problems with 4X4 engage/disengage issues, possible your t-case needs some gear oil too.

[Fishermuskie]

Thanks for the ideas,

I have checked this out and the 4 wheel is disingaged. I have put about 400 miles on the truck since this has been happened and haven't broke down yet.
The reason I asked if the front drive shaft would turn when the vehicle is not in 4x4 was to be able to rule all of that stuff out.

Any other ideas?

Good luck,
Dave

[denisb]

Unless you managed to get some mud inside your rims while doing this, I'm fresh out of ideas.

[hbracing]

I have had wheel bearings cause this. Hope this helps........