2nd Gen Non-Engine/Transmission Driveline Noise

[gitchesum]

This thing is driving me nuts(keep it to yourself MDW)



I get this howling noise only when I decellerate from about 30mph to 5 mph. It gets more pronounced when I am taking a left hand turn or curve. I would also get a grinding type noise at idle speed in 2nd gear.



I've changed the rear fluid, checked the outer wheel hub bearings and checked the carrier bearing and u-joints. I haven't replace the u-joints but I've had the back of the truck lifted, ran it though the gears and the noise won't reproduce itself without a load.



What on God's green earth can I check next? I was thinking pinion bearing but would it only get louder with a left hand turn if it was the pinion bearing?

What about LSD Clutches?



Any suggestions are appreciated.

 

[Sled Puller]

Made ya look Gitch!



hehehehehhe

 

[Sled Puller]

Originally posted by gitchesum

I get this howling noise only when I decellerate from about 30mph to 5 mph. It gets more pronounced when I am taking a left hand turn or curve. I would also get a grinding type noise at idle speed in 2nd gear.

What gear when you are decelerating?

 

[gitchesum]

It's does it in any gear, even coasting in neutral.

 

[Bill Lins]

Since it's more pronounced when you're turning left, try checking the RIGHT FRONT wheel bearing (you said you already checked the rears, right?)

 

[grtescpa]

Originally posted by gitchesum

This thing is driving me nuts(keep it to yourself MDW)



I get this howling noise only when I decellerate from about 30mph to 5 mph. It gets more pronounced when I am taking a left hand turn or curve. I would also get a grinding type noise at idle speed in 2nd gear.



I've changed the rear fluid, checked the outer wheel hub bearings and checked the carrier bearing and u-joints. I haven't replace the u-joints but I've had the back of the truck lifted, ran it though the gears and the noise won't reproduce itself without a load.



What on God's green earth can I check next? I was thinking pinion bearing but would it only get louder with a left hand turn if it was the pinion bearing?

What about LSD Clutches?



Any suggestions are appreciated.

Check the drive shaft intermediate hanger bearing. They do go dry.

 

[gitchesum]

Forgot to add, I replaced the front wheel bearings on both sides.



I've had the driveshaft off twice since this noise started and the carrier bearing has no bind-up at all when I turn it. It also doesn't have any play.

 

[Sled Puller]

Hate to say this, but maybe your new front bearings are bad.

Run it until it breaks, then you will know for sure.

 

[Jetson]

What about something that is touching and vibrating... exhaust, manifold, bad trans or engine mount...

 

[ramman]

I had a noise that I swore was a front wheel bearing but turned out to be the hx-40 down pipe I had recently installed was touching the frame rail in a left turn,sure fooled me sounded just like a bearing.