Third Diff's a Charm

[HummBebe]

Originally Posted by Sewie

Its a grinding noise when you let off the gas and coast. It was really faint this time and could only really be heard if I was going 40MPH+.

Last time it was the same noise, but louder and very obvious.

Mine's doing the same thing....it's going in on Monday...

[HummBebe]

You didn't mention if it is being covered under warranty.....is it???

[Hmmm2]

Is it a continuous grinding sound even when coasting???? Do you have 5-speed manual or automatic?

[HummBebe]

It almost sounds like the heat exchangers rattling, but it only happens when coasting, and makes no noise below 30mph.

Mines a bunch louder than it was last week....


DAMMIT!!!

[lotus4s]

It's a MOAB virus......


I really do feel for you Sewie and Bebe and HI, they really should get to the bottom of this and do something about it. It seems like you guys/gals who wheel a little more hard core particularly rock crawling are the ones having the most problem. I'm afraid my number is going to be up one of these days.....

[f5fstop]

All I can say is, this issue pisses me off more than any other issue GM has at this time. Maybe, and I say maybe, if enough front diffs are replaced, the people who made the decision not to go with the heavier cast iron front diff (vs the aluminum diff) will decide it is best to replace with cast iron diffs as the vehicles come in with broken front ends.

I have grumbled, argued and made slide remarks to certain people in regard to this issue and all I get are cold stares. I have tried different approaches such as make the stronger diff part of the adventure package for a hundred more.

l'm at a loss as to what to do.

I can say that I have heard the stronger gear set should help, but will it help for those who climb in the Moab area or the Rubicon. Sure it will help quite a few who just off-road on severe roads such as the ones I ran in Moab. But for those who are out climbing the escalator, golden spike, etc.?

All I can say is I can see no way, someone could refuse warranty on the front diff if it was destroyed off-roading. Hummer advertises this fact on their own website, and I cannot believe any arbitrator would rule in favor of GM/Hummer on this issue.

[HummBebe]

I'll just continue my quest for the cast iron housing.

Problem is, they were fine in Moab and on the Rubicon. We did not break anything, to the point of failure.


Sewie, HI and I, had our initial R&P's changed before they decided to increase the hardness of the R&P. So we probably have old defective stock.

However,

I'm thinking that once the housing flexed enough to break the gear, it could be permanently out of shape?

Maybe replacing the the R&P AND the Housing could be the ticket?

If they base thier decisions solely on beans, I would be surprised. It could be that some obscure engineer is defending HIS decision to use aluminum.

Whatever......

They need to get it figured out before my warranty is up.

And Sewie, see if you can get them to change the housing too.

[HummBebe]

Originally Posted by f5fstop

All I can say is I can see no way, someone could refuse warranty on the front diff if it was destroyed off-roading. Hummer advertises this fact on their own website, and I cannot believe any arbitrator would rule in favor of GM/Hummer on this issue.

See, someone needs to show the GM warranty Reps their own fooking website.

[Sewie]

Originally Posted by HummBebe

You didn't mention if it is being covered under warranty.....is it???

I haven't heard otherwise.

[Sewie]

Originally Posted by hummbebe

You didn't mention if it is being covered under warranty.....is it???

I may have jinxed myself.

The dealer says their area rep has been giving them grief about some of their warranty work. Since this is the second failure of the same part in 6-7 months they're afraid the claim is going to get rejected. They asked me to escalate it with Hummer assistance so they can go ahead with the work under warranty. I'm on the phone with them right now.

[Sewie]

I also went back to look at the diff. You can see the damage to the pinion gear and some wear on the ring gear.



The tech is the same guy that worked on it last time. Since I didn't get to see the damage last time I asked him about it. He said there were chips on both the ring and pinion gears last time, on multiple teeth. They replaced the whole diff last time, housing and all.

[HummBebe]

How is that your problem???

[Ipedog]

Originally Posted by HummBebe

How is that your problem???

xUmpteen Brazillion!

[Sewie]

OK, let me just say that Hummer Customer Assistance ROCKS!!!!

So I called up and said I wanted to open up a case since my truck was in for a second diff failure. The lady took my info and said she'd put me on hold while she called the service manager. A couple minutes later she comes back online and tells me everything will be covered under warranty, she'll check back in with me on Monday, and they'll compensate me for the inconvenience. She said they just want me to be completely satisfied. The whole call took less than 10 minutes.

BTW, I don't really blame the dealership. They suggested I call so we could get past the area GM rep and speed up the process. The service manager had no problem doing the work under warranty.

[Urban Ops]

Originally Posted by HummBebe

Mine's doing the same thing....it's going in on Monday...

I've noticed like a gear whining noise when decelerating too. More now than when it was new. Let me know what they say. I'm always looking for an excuse to go see Dina and Tina.