Possible transfer case noise

[Douglas Friedberg]

I just read this, and your response today about the oil change. You may just have a malfunction in the traction control. Bad sensor for wheel or shaft speed.

Are you familiar with the feeling from traction control activation? It can cut engine power; use the ABS to apply brakes to individual wheels, and make a jerky feel in the vehicle, along with the attendant noises from the brakes and pump.

Some of that not all of it. Traction control message comes on power gets cut it well only coast and only happens on start up. Doesn’t feel like any braking is taken effect. No I am learning this system. Only been through one little winter with it. Just know the noises of changing to diff modes of wheeling

 

[Douglas Friedberg]

Some of that not all of it. Traction control message comes on power gets cut it well only coast and only happens on start up. Doesn’t feel like any braking is taken effect. No I am learning this system. Only been through one little winter with it. Just know the noises of changing to diff modes of wheeling

No ABS codes however system went nuts when I was doing donuts with it last winter. But it reset itself after shut off.

 

[Douglas Friedberg]

I’ve been disabling system at turn on to see if it doesn’t happen. So far no direct corollation information yet to make that determination

 

[Douglas Friedberg]

Does it use abs senors then for wheel spin or is there another group of sensors for traction control??

 

[YukonRog]

You say "with Auto button". Does that mean you can select 2WD? If so, try driving in 2WD only and see if it still makes that noise. I believe your Transfer Case is worn out. When they're in "Auto" they constantly go in and out of 4WD causing premature wear. When the clutches are worn it then doesn't fully engage the gears. Just like that derailer sound.

 

[Bill 1960]

Does it use abs senors then for wheel spin or is there another group of sensors for traction control??

Traction control uses the same sensors as ABS. One at each wheel.

I’m not certain if the transfer case auto 4wd control uses the wheel sensors, transfer case shaft speed sensors, or all of the above.

 

[Douglas Friedberg]

You say "with Auto button". Does that mean you can select 2WD? If so, try driving in 2WD only and see if it still makes that noise. I believe your Transfer Case is worn out. When they're in "Auto" they constantly go in and out of 4WD causing premature wear. When the clutches are worn it then doesn't fully engage the gears. Just like that derailer sound.

Sorry was incorrect in my discription of. I meant disable button for stability control. And no I don’t use auto button for wheel control always left in 2 wheel drive. I don’t use auto button.

 

[Douglas Friedberg]

Sorry was incorrect in my discription of. I meant disable button for stability control. And no I don’t use auto button for wheel control always left in 2 wheel drive. I don’t use auto button.

So output shaft of transfer case has a shaft sensor. ???

 

[Bill 1960]

So output shaft of transfer case has a shaft sensor. ???

Front and rear.

https://www.tahoeyukonforum.com/threads/np-246-pinout.130732/post-1629939

 

[YukonRog]

I drained the transfer case oil and refilled it. Nothing seemed out of place.

How much fluid did you get when you drained it? Was it clean? Did the case appear to have fluid on it anywhere? With that mileage I would think you could grab the front output shaft and feel play where it goes into the end of the case.

 

[Douglas Friedberg]

How much fluid did you get when you drained it? Was it clean? Did the case appear to have fluid on it anywhere? With that mileage I would think you could grab the front output shaft and feel play where it goes into the end of the case.

For the most part it was decent oil and everything has play or clearence but what kind of numbers is excessive. .010 .200 numbers would help.

 

[YukonRog]

For the most part it was decent oil and everything has play or clearence but what kind of numbers is excessive. .010 .200 numbers would help.

Pretty much if its not an audible clunk it probably okay. Usually with that mileage that's where you'll see the wear though. And that end bearing will start to "rumble".

 

[Douglas Friedberg]

I had to work on my daughters car it’s a Ford but rear ends are rear ends. I didnot here any noises dad. Yea sure. Axle broke off behind bearing and eat damage housing nothing left of bearings lucky rollers didn’t get into ring and pinion. Point is I made some fixtures on my lath out of water pipe fittings and swedged bad into shape tube sizes and had a nice interference fit for new bearings and saved rear end housing. Some stuff goes back to good old blacksmith days. And American ingenuity. New axle and seals and bearing. Turn off the loud music