98 K-1500 noise...

[nygacr95]

Okay, so I posted this over in the Tahoe area, but since it is essentially a K-1500 anyway, let me ask here for some help.... I apologize for the post here, but this one is frustrating me greatly.

I've been chasing a noise for two months on my 98 tahoe. It sounds like a weird road noise, it comes in around 20-25 mph, like a light scrapping, and continues with speed, equallizing, around 50 mph, where you can still hear it. when it gets past 30-35 mph, it becomes more of a whooshing noise, like a flit flit at wheel rotation. I had this thing on and off the jack, rotated all the tires and wheels out, replaced the rear U joint, rear wheel bearings, (which the LR was making a slight noise) front wheel bearings, (and the left front a second time) and (unrelated) upper and lower ball joints, tie rod ends, front rotors, brakes, etc...

what I have noticed recently, in the last few days, is that you can sorta coast arount 35-40 mph, turning the wheel slightly left, maybe enough to make it drift to the left, draws the noise loud, and turning it slightly right, silences the noise. this only started to develop, and is making me think that I possibly got an issue with the left front driveshaft.

Anyone experience this? I am getting ready to swap out the LF halfshaft, and I guess I just want to fix this thing. Also, does anyone have a good timken/national number for the front steering knuckle seal? I cannot find a listing for this part anywhere, and if I am going to replace the axle, I want to put a new seal in as well.

[jdmccright]

Check the ABS sensor for build-up and proper gap with the sensor ring on the hub assembly. This can accumulate metal shavings, eventually closing the gap and causing scraping. Also check to see if the sensor itself isn't scraping against the toothed ring.