2015 Tahoe/Grinding/rough noise from front of vehicle

[wjburken]

My excuse reason is always "fat fingers."

Yeah…..that to. Also, sometimes I stutter when I type as well.

 

[fatmonk8]

Well gents, the mystery continues as the diff looks fine to me. But I am also a novice so who am I to say.

 

[fatmonk8]

Actually I found this, maybe the source of the metal?

 

[fatmonk8]

Definitely the source of the metal

 

[fatmonk8]

What is this washer for? Looks like it was just free moving around against the teeth.

 

[fatmonk8]

Looks like this gear is for the 4wd. Makes sense as I didn't realize it would put the tuck in 4wd while in automatic mode while driving on pavement. So probably wore down after being driven in 4wd all the time on pavement.

I can't seem to find this part to replace or this washer. Would I be able to just replace the washer. The gear seems fine thankfully.

 

[fatmonk8]

Found the part!

It's a 3.55 mm Front Drive Axle Clutch Gear Shim.

Pretty sure the shim is not supposed to have this shelf on it. It's worn down pretty bad.

 

[Fless]

Looks like this gear is for the 4wd. Makes sense as I didn't realize it would put the tuck in 4wd while in automatic mode while driving on pavement. So probably wore down after being driven in 4wd all the time on pavement.

If AUTO is working correctly the front drive will engage only when the system senses slip in the rear drivetrain. It's not in 4HI all the time, and it's generally okay to have it in AUTO. Having said that, I won't run AUTO on mine unless the road conditions are changing enough to warrant it. Otherwise it's 2HI or 4HI.

 

[fatmonk8]

If AUTO is working correctly the front drive will engage only when the system senses slip in the rear drivetrain. It's not in 4HI all the time, and it's generally okay to have it in AUTO. Having said that, I won't run AUTO on mine unless the road conditions are changing enough to warrant it. Otherwise it's 2HI or 4HI.

Gotcha, I guess from prior conversation I assumed being in auto it would be in 4wd more often then not.

Would there ever be a situation where it keeps it in 4wd in auto when it's not supposed too?

 

[Fless]

Gotcha, I guess from prior conversation I assumed being in auto it would be in 4wd more often then not.

Would there ever be a situation where it keeps it in 4wd in auto when it's not supposed too?

Not if the system is working properly, and if it was in 4hi you'd probably notice it "jumping" or jerking during hard turns or when the drivetrain binds on hard pavement. Called "crow-hopping." Perhaps a bad encoder motor could set it to 4hi but show the AUTO light on.

I had just the opposite happen to mine. We'd switch to 4hi, the 4hi mode light would light on the switch, but we could feel it slip in and out as if it were in AUTO. That was an issue with the encoder motor, verified by using a Tech 2 to show that 4hi was commanded but AUTO was actual.