2003 suburban vibration at 65 to 70 mph

First record the rpm when the vibration occurs. Then while in park rev the engine to this rpm to see if it is there. If not then the engine should be ok. Next when on the highwaqy and the vibrations starts, put the transmission in neutral and see if it goes away. If so the go faster than when it starts and then put it in N and let the speed back down to 45 and see if it starts again. If it does then you may have a tire balance problem. If it happens while accelerating to 45 and goes away when letting off the gas it may be the u-joints.

Try having the front wheels balanced and tracked .

Ticking sounds like a dry lifter, when was the last time you changed the oil and filter? Humming sounds like you need a tire rotation because of uneven tire wear.

That turning of the steering wheel puts lateral pressure on CV joints. IT can also put a load on the axel bearing. If the vibration stops then you have an idea where to look. IF it does not stop then it is most likely tires.

Harmonic balancer.

I would look at the half shafts or cv axles.

check for problem drive line "U" joints or cv joints

It sounds like a bad U-joint to me. The only way to properly check u-joints is by removing the driveshaft. The joint should move freely, any binding will cause the vibration.

Interference fit- meaning it can be worked off with a little help of a hammer andpunch, It can also be a slip fit so try before you pry. Good Luck _Ned_