Should This Driveshaft Be Turning?

[Doozer]

On a 2002 Silverado, when in the 2HI setting, should the front drive shaft turn as the truck is driven or should it remain stationary?

Thanks,

Rich

[VMax2007]

Stationary.

[cdmm151]

Unfortunately you have the one of the dumbest things GM did in the model years 2002-2004. They set-up the transfer case to keep it engaged. I had the same thing on my 2003 Suburban. I sold it and went to 2005 which did not keep it locked in.

Check with your dealer but I don't think it can modified.

[seadoons]

Dumb. It makes sense though. I don't use my 4WD all that often but whenever I change the transfer case fluid of front diff. fluid it looks very "used" just like the rear diff fluid.

[Doozer]

The reason I asked is b/c as I mentioned in another post, I have a hum coming from the front of the truck that increases with the speed of the vehicle. I wondered if the drive shaft was staying engaged when it should not be and is causing the hum. If it's supposed to be constantly engaged in this model year, then I'll have to check something else to find the source of this sound.

Thanks,

Rich

[HawkeyeOC]

The reason I asked is b/c as I mentioned in another post, I have a hum coming from the front of the truck that increases with the speed of the vehicle. I wondered if the drive shaft was staying engaged when it should not be and is causing the hum. If it's supposed to be constantly engaged in this model year, then I'll have to check something else to find the source of this sound.

Thanks,

Rich

 

Assuming the front driveshaft is supposed to be turning, look for bad front diff bearings or the transfer case. Good luck

[cdmm151]

As with my 2003 Suburban I had the whole front differential rebuilt at 5000 miles. There was a bearing that was coming apart. The lube was a dark silver metallic color. Check that first.

[Doozer]

The lube was a dark silver metallic color. Check that first.

 

That sounds like a good idea.

I found something new tonight, as I was driving about 50 mph around a long, sweeping curve to the right, I noticed the noise was decreased or maybe even gone. This seems to me like it could be a wheel bearing. Anyone think I may have located the problem?

Thanks,

Rich

[superjim]

I found something new tonight, as I was driving about 50 mph around a long, sweeping curve to the right, I noticed the noise was decreased or maybe even gone. This seems to me like it could be a wheel bearing. Anyone think I may have located the problem?

Thanks,

Rich

 

 

It is possible that it is a wheel bearing.

 

Check it by during side to side "S" turns at about 20 or 30 mph. Like the NASCAR guys do, to clean their tires, just before a restart.

 

If the noise INCREASES turning one way and DECREASES when turning the other way... it is VERY possible that it is s wheel bearing.

 

Make REAL SURE you are in a safe area before you do that.

[VMax2007]

Make REAL SURE you are in a safe area before you do that.

 

 

Yeah, like a elementary school playground or a Kindercare parking lot.