Rumble noise when decelerating only

[Geotrash]

I have also balanced and rotated the tires.

I will let you all know what happens next.

Thanks for keeping us posted.

The best way I know to diagnose this is to take it to a shop that has a set of chassis ears.

 

[Fless]

Do you have the 2-speed transfer case with 4lo?

When you pull it, check those front propshaft u-joints if you haven't yet.

 

[Kodiak Yukon]

Do you have the 2-speed transfer case with 4lo?

When you pull it, check those front propshaft u-joints if you haven't yet.

I do have 4lo. I am probably going to replace the u joints there too. Just because it’s out. This car is about to have more new parts than old.

 

[B-train]

I have and there isn’t much movement. I don’t feel like it could be a motor mount since the noise is still there when in neutral and I apply the gas and rev the rpm’s. Vibration is still there. Correct me please if that doesn’t rule it out.

However maybe a different mount?

This has been going on too long getting kind of frustrated with it honestly.

The noise frequency does change at speeds. Smooths out at high speeds.

I asked that because I wasn't sure what you meant with the neutral and rpm. Clarification has helped to know it follows.

It could be trans related or something related to TCC. Otherwise maybe you are seeing an engine driveability issue that is manifesting itself in a weird way.