Update…. Yesterday the dealer called me and said FCA put a service bulletin out about the thud noise.... Said to replace the 4 rear rubber suspension bushing with new updated polyurethane ones. Waiting on them to come in. Just like I told them. It was coming from the suspension. So everyone have your ears open!

 

"The owner of the dealership has a Trackhawk, they want to remove his driveline and stick it in mine."

Wow, that sounds strange. I think that would technically be a used part. WTF with warranty claims after that?

I'm with you on getting your money back NOW.

 

"The owner of the dealership has a Trackhawk, they want to remove his driveline and stick it in mine."

Wow, that sounds strange. I think that would technically be a used part. WTF with warranty claims after that?

I'm with you on getting your money back NOW.

Since the drive line comes from a third party and they can't tell FCA if it will be 3 weeks or 3 months this is what they have come up with. In 64 days of ownership the dealer has had it 43 of those. To say the least I'm over it!

 

Mine is doing the same thing. It’s mostly when putting it into gear and in reverse. Mine is going in next week for an oil change and a couple cosmetic issues to get fixed. Will post what my dealer tells me.

 

Today they tell me the noise is back. They ordered a new sway bar. I called the SRT department and filed a claim. I'm done, also has a new exhaust leak that developed that they can't find. Also passenger side fender well to well rocker panel is out of alignment.

 

I have a lawyer pursuing lemon law on my TH for zero money. So many issues that I am losing count. It is a shame, because I love it when I have it.

 

I didn't have to get my attorney involved but I was ready to if needed. The dealership Is a GMC, Buick, Jeep, Dodge and I have dealt with them for 34 years. I usually buy a new Denali every year or so. They assisted with FCA in me getting a new one which helped.

 

9k miles nothing yet. Sorry to hear about all this id be on fire! Id take that F***ing vehicle and drive it right through their freakin showroom. ROADHOUSE!

 

All of the posts does sound like a transfer case issue. The high torque and quick shifts can stretch the chain in the transfer case, or can wear the cogs making the u-shape holes larger giving the chain more room to play before full load tension. I had this issue on a land cruiser 100 and also a discovery 3. Used both a lot in offroad with trailer for hauling bobcats and mini excavators. Also another reason on the LC100 was wear on the front outer CV splines including the wheel hub. The trackhawk might be fighting for traction on the front and jerking the front driveline creating shocks on the splines.

Also might be the bushings for the rear diff. They might be getting soft and allowing more play.

Just my 2cents

 

Transfer Case Diagnosis

If a pop is heard when the vehicle is placed into 4WD, it’s caused by excess slack in the chain striking the case and then snapping back into position. To test a transfer case for excessive slack, place the vehicle in park and engage the parking brake. With the case locked in park, rotate the front or rear propeller shaft flange back and forth checking for play. There should be none or very little. Check with vehicle manufacturer’s specifications before proceeding. Worn or faulty bearings make a growling sound when they are spinning.

 

Check bushings, also might be a bushing from the sway bar. Try driving at a pace to swerve left-right multiple times and listen if you get the popping sound. Also with the TH off, take the wheel off, hold the axle with one hand and rotate the brake disc with the other, try and feel for play between the 2. Might be worn splines on the hub and axle.

 

Have not had that issue.....yet.

 

Is this more prevalent in track mode? I’ve noticed the downshift to 1st can be a tad abrupt but I don’t know about a thud.

 

I've noticed it the most in the Auto mode

 

Haven't noticed it.

 

Dealer has had it all week and said they came up with the spare tire being loose. Got it back and at the first red light 1000 feet from the dealership the pop was still there. I was so pissed. The sound is happening while coming to a stop or when placing in gear from drive to reverse or back & forth. Also we are in upper 80 to 90 degree weather. I don't have a clue. I do know the spare tire was still loose and the plastic retainer which holds it down is cheap! Anyone please????

 

It sounds like your driveline and not your brakes to me. I would ask the service advisor to take a ride with you so you can demonstrate it for him. I would ask them to check your 4-wheel drive transfer case and/or your differentials. It sounds like you have some slop in your driveline somewhere which explains the “thud” sound when stopping and shifting from park to drive.

My spare tire plastic retainer was loose too, but it made a squeaking sound when hitting the brakes hard and not a “thud” sound. It was easy to figure out and once I tightened it down, it went right away.

Sorry you are experiencing this, and I hope this helps.

 

Took a ride this morning with the service manager and he heard the sound. Taking it back Monday, he thinks it is something loose hitting the bottom of the vehicle. I guess we will see!

 

Ok…. Keep us all posted on what you find out.

Thanks

 

Ok…. Keep us all posted on what you find out.

Thanks

Update today! Dealer has ordered a new drive line. With only 1300 miles I am worried. If this doesn't correct it they will be giving me a new one as I made that clear with dealer ownership today!!

 

A new tranny?

 

No drive line. Which runs the all wheel drive. Like a drive shaft on a 2wd.

 

Got it. How long has it now been stranded at the dealer for?

 

That sucks. Did they at least give you a loaner?

 

Yes, What I should have kept! A 2017 GMC Yukon Denali supercharged..... Which they gave me a 2018 to drive but still never any problems with my 17 that sold before I even got the Trackhawk.

 

Not the loaner. My old Denali had the Hennessey HPE650 upgrade. I should have kept it

 

I believe I have the same issue. I can only hear it if I am backing up at more than just an idle. It happens when I am in reverse and I give it a little quick throttle. You can hear a thud or creak of some kind. It makes sense to me that it is the bushings on the suspension. Do you think this sounds like the same thing? Let me know if it resolves your issue and I will be sure to bring it up the next time I bring mine in to the dealer.

 

Will keep you updated. Took it in today.

 

Mine has been making a similar sound. When I start driving from a stop, or slow down to a stop, I hear a sound that seems to be coming from the rear. I would say mine sounds like someone hitting an empty 5 gallon bucket, thud like sound. It's going to the dealer next Friday for an oil change, the cruise control issue, and I reported this sound to the dealer. We will see what happens. I have 5300 miles on it.

 

I'm going to tell you to let off the brake and drive it right down their throat. I have been lied to and lied to. Today they located me a new one. They have no clue on what causes the noise neither does FCA. But I will tell you when you are use to running over people and getting paid to do so they suddenly remember that and get on the bus and agree to your requests. Don't let up on them!

 

Guys, thud sound happening here as well. I have read all posts in this whole thread and there doesn't seem to be an actual answer. Is it the driveline or is it the suspension bushings? Or is it the wheel caps? (joke on the last one).

 

I know that they kept putting shop ears on everything. They told me that the sway bar replacement had made the noise go away.... At that point after 5 weeks of them having it I was done. FCA has more excuses for the problems but NO answers. I will tell you that for $100K you shouldn't have these kind of problems. Good luck. I 456 miles on the new one and it runs so much better than the Lemon. Keeping my fingers crossed.

 

My wheel caps fit nice and snuggly, thus no thud sound. Lol

Nobody seems to have an answer, that’s probably why Steelers got a replacement TH.

 

I have similar issue when starting off after being parked, i can feel the thud in my feet as well as when i stop

 

Man after reading this I think I’m gonna have to bring mine in.
When putting in drive or reverse you can hear the thud. I heard it awhile back but thought well maybe it’s still breaking in since new.
Definitely don’t want to modify it now Incase something is already wrong.

 

I have the thud sounds when I'm around 30 mph and just coasting with foot on brake and then when I turn and give some gas. Taking it tomorrow to dealership.

 

Guys I feel your pain. The new Hawk has been in for almost 4 weeks now with antifreeze in the motor at 800 miles. FCA will not return calls and now my dealer has turned into a Pu**y I don't know if these things are doomed or it's just fiat's involvement either way I will never buy another FCA product. If you live in the southern states start blowing up the FCA Rep Gaylon Morgan you can find him on FB. Hammer down again.