Recently I've notice a knock or grinding noise that seems to come from underneath the center console when decelerating or cruising at 30-35 mph. I'm assuming that it's coming from the transmission. I've had the truck almost a month. It has all the service records up to 90K which was completed in Aug 09. The truck now has 113K. I plan to check/change the trans fluid and filter. Are there any diagnosis or other maintenance services that I should complete? Thanks

 

Check the front drive shaft

 

agreed, stop driving it. you need to climb under the truck and see if the front drive shaft has been rebuilt with greasable u joints. if not you need to get it rebuilt at a local drive line shop or replaced with a new one from Tom woods or Great Basin Rovers.

 

I already had the drive shaft rebuilt. Any other diagnoses?

 

I would check the output shafts on the transfercase for play. Might be a bad out put shaft bearing.

 

could be drive line slack as well.

 

Remove the front drive shaft, engage the CDL and drive on the rear shaft only to see if the noise goes away.

 

Ok, stay tuned.

 

Yes, agree with Mike and others...

Please do not drive until you try Mike's remedy. That sound is EXACTLY what my front drive shaft sounded like within 10 minutes of it busting on my truck. Very very bad news if it goes while driving...

Shannon