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Discussion Starter #1
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I have a 2016 2.8 with a 5.5” Zone Lift/33” tires.

I am experiencing harsh grinding in the drivetrain (feels like it is coming from the transfer case right under the floor) when I accelerate from a stop with a load/towing a trailer.

Problem is produced regardless of being in auto 4wd, 4x4, 2x4.

Truck is smooth as a luxury sedan at highway speeds and there is no vibration that would be expected from slip yoke/shaft binding. The grinding only happens when punching the throttle while carrying or pulling a heavy load from a dead stop.

I also have the notorious studder and occasional clunk during shifts, but this grinding problem is entirely different and feels horrible to the point that I’m surprised something hasn’t broken yet.

I have no idea what is causing this. Has anyone else experienced something similar?
 

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My guess is when the axle rotates under load (commonly referred to as axle wrap) your driveshaft U joints are getting unhappy. You will break one eventually and it will be catastrophic. Shimming the rear axle with a degree shim is a common fix for something like this.

On a side note, let us know where you got those tow mirrors
 

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The mirrors look just like the new body style Silverado's/ Sierra's (2007-2013...ish). Which can be bought for cheap. But then again, that Austrailian company, Clearview, makes them and they look just like the mirrors I mentioned, but they are around $500-600 :(
 

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Still has the stickers on the tires. I see one on the drivers front ;) Truck looks very good though. I'm guessing what RockCrawler mentioned might be caused by the zone lift to accommodate the larger tires?
 

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Discussion Starter #7
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Ok, the mirrors are from Clearview but the upper arms were replaced with gm lower arm parts to get rid of the ugly ‘hump’ at the top of the hinge.

Here’s the part list:

Zone 5.5 Lift, Fox 2.5 Coilovers up front, Fox 2.0 shocks on the rear, AirLift overload air bags on the rear, RRO Rock Sliders, Method Grid 17” wheels, LT285/70R17 Wildpeak A/T tires, SnugTop Lid, Spray Bed Liner w/BedRug upholstery, ClearView extendible mirrors, OEM Fender Flairs.
 

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Discussion Starter #9
I still don’t haven’t nailed it down.

I am going to just take it to the transmission shop with a loaded trailer and see what the technician thinks.

It only does this when 3/4 or more throttle is applied from a stop with a trailer behind it.. but when the issue happens it is really aggressive and something is going to fail sooner or later.
 

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View attachment 5241 I have a 2016 2.8 with a 5.5” Zone Lift/33” tires.

I am experiencing harsh grinding in the drivetrain (feels like it is coming from the transfer case right under the floor) when I accelerate from a stop with a load/towing a trailer.

Problem is produced regardless of being in auto 4wd, 4x4, 2x4.

Truck is smooth as a luxury sedan at highway speeds and there is no vibration that would be expected from slip yoke/shaft binding. The grinding only happens when punching the throttle while carrying or pulling a heavy load from a dead stop.

I also have the notorious studder and occasional clunk during shifts, but this grinding problem is entirely different and feels horrible to the point that I’m surprised something hasn’t broken yet.

I have no idea what is causing this. Has anyone else experienced something similar?

I experience the same thing.. but not under load from a trailer. I haven't figured it out.. driving me nuts
 

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Discussion Starter #11
It’s really an unsettling feeling. It sounds and feels like the gears in the driveline are being shredded.
 

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It’s really an unsettling feeling. It sounds and feels like the gears in the driveline are being shredded.
Ya! harsh sound too.. I haven't brought it to the dealership yet (I've had multiple problems with mine and the have been less that useless) thinking about taking it to a third party shop
 

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Discussion Starter #13
I’m going to take mine to a high end transmission builder in Chino to diagnose it. I already have a fortune in this mini truck, so I’ll just take the extra hit upfront to find the problem and spare myself the headache of going to the dealership every other week.

Then I’ll see what the dealer will do to resolve it.
 

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I’m going to take mine to a high end transmission builder in Chino to diagnose it. I already have a fortune in this mini truck, so I’ll just take the extra hit upfront to find the problem and spare myself the headache of going to the dealership every other week.

Then I’ll see what the dealer will do to resolve it.

sounds good! keep me posted man, I'd appreciate it !
 

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My 2 cents is the lift and tire size is putting undue strain on your drivetrain, its reccomended with 33" tires that you swap the gears in your differentials.
 

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View attachment 5241 I have a 2016 2.8 with a 5.5” Zone Lift/33” tires.

I am experiencing harsh grinding in the drivetrain (feels like it is coming from the transfer case right under the floor) when I accelerate from a stop with a load/towing a trailer.

Problem is produced regardless of being in auto 4wd, 4x4, 2x4.

Truck is smooth as a luxury sedan at highway speeds and there is no vibration that would be expected from slip yoke/shaft binding. The grinding only happens when punching the throttle while carrying or pulling a heavy load from a dead stop.

I also have the notorious studder and occasional clunk during shifts, but this grinding problem is entirely different and feels horrible to the point that I’m surprised something hasn’t broken yet.

I have no idea what is causing this. Has anyone else experienced something similar?
You ever get this problem resolved?
 

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The problem is still there. I just avoid flooring it when pulling my trailer from a stop.
Have you tried changing the fluid in your transmission, transfer case or differentials yet? Might see if that doesn't help.

Also, I don't know if it will help the grinding, but if you aren't tuned already, you should really look into it. It will get rid of the clunky, hard shifts. And tuners can account for your bigger tires. If I were to recommend someone, it would be Jason Hackler's tunes (hACKman customs). Can be got directly from him, or through Shield & Spear Performance who sell his tunes. I'm very happy with my truck after the ECM and TCM tunes. The driveability and confidence while driving is improved drastically.
 
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