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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 01-09-2017, 02:17 PM   #1 (permalink)
AliBaba99
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Transfer Case Issues

Hi Everyone. Need some help.

May of 2016 I bought a 2015 Denali HD Duramax that was 8 months old with 27K miles on it at a steal of a price. A farmer retired, Traveled the US and decided he wanted to go back to farming. Didn't want to destroy a Denali and went back to a 99 work truck. All is good with it but after 4 months i could no longer stand the hard (slam) shifting and was driving this beast like a baby.

Service #1 (30 Days on the nose) (October 2016)
They replaced the Valve body for the transmission and then rebuilt the back half of the t-case. Reprogrammed the entire car to clear all learning from previous driver.

Service #2 (25 days today) (December 2016)
Same issue again and they said it's the slip rings in the t-case and will have to rebuild again. Still waiting to see what parts actually get replaced and when i get it back.

I don't tow anything, I don't haul anything other than my 2 year old kid and lord knows i don't drag race or drive like an idiot. I was also told that there are 2 other d-max's in the same shop for t-case issues as well.

Any of you out there see or had this issue?

Just to also let you know I have contacted a lawyer about a possible Lemon Law suit and that is being looked at.

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Old 01-09-2017, 02:26 PM   #2 (permalink)
willydmax
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You should probably find a different dealer and get their opinion what the issue is.

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Old 01-09-2017, 02:52 PM   #3 (permalink)
AliBaba99
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Quote:
Originally Posted by willydmax View Post
You should probably find a different dealer and get their opinion what the issue is.
I have. Prior to taking it to them i went to my other 3 closer dealers all within 20 minutes and they all said "It's normal"

These guys won't let my truck leave unless it's driving like it's supposed to. I have to drive close to 45 minutes one way to them and they are also the most highly rated diesel truck guys here in middle TN.
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Old 01-09-2017, 11:13 PM   #4 (permalink)
AliBaba99
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So got an update and i'm a little relieved. Looks like what was causing the clunking noise this time was the rear end. They changed out the Yoke, seals and gears. From what they can tell they believe that the Transfer Case issues from the first repair cause the rear end problems by constantly shifting hard (slamming) into every gear.

Going to pick it up tomorrow so hopefully this is the end of my problems.
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Old 01-09-2017, 11:57 PM   #5 (permalink)
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If any admins out there see this can you move to proper area. I posted in the wrong Forum section. Thanks
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Old 01-10-2017, 02:57 AM   #6 (permalink)
davester
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Um, shouldn't that be the transmission slamming into gears all the time? The transfer case should generally be a pass-through unit....unless you are constantly shifting to and from 4lo...
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Old 01-11-2017, 12:01 AM   #7 (permalink)
AliBaba99
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Apparently the issue is even though the Transfer case is a pass through the original problem was the gears inside were stripped (what i was told) and there was too much play. This causing my now second issue with the rear end where too much play caused stress on the rear end and weakened it.

Picked it up today and it drives amazing again.
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2015 Denali HD Duramax
Leveling Kit
Removed Front Air Dam
3M Crystalline Tint
VIM/Nav Bypass
Airlift LoadLifter 5000 Ultimate
Airlift Wireless One
B&W Turnover Ball Hitch
Tailgate Electronic Lock
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Old 01-11-2017, 02:25 AM   #8 (permalink)
davester
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Is it AWD or just 4WD?
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Old 01-11-2017, 10:34 AM   #9 (permalink)
AliBaba99
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Quote:
Originally Posted by davester View Post
Is it AWD or just 4WD?
4WD but i have only used it twice. I'm pretty sure there is no AWD option on our trucks.
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Leveling Kit
Removed Front Air Dam
3M Crystalline Tint
VIM/Nav Bypass
Airlift LoadLifter 5000 Ultimate
Airlift Wireless One
B&W Turnover Ball Hitch
Tailgate Electronic Lock
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Old 01-11-2017, 03:39 PM   #10 (permalink)
davester
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Then that explanation that your t-case was causing the hard shifts makes no sense to me, short of the sun-gear in it having missing teeth.

For most/all 4wd t-cases. the input goes through a sun gear (to provide hi/lo/n), then it's a solid shaft all the way to the output. And just shifting up through gears, the drivetrain stays under power, so backlash doesn't cause it (and it would be the sun gears with the backlash anyway).

But then again, I don't know which specific transfer case your truck has...

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