Transmission Clunk

[IPRoutes]

So I played with my transmission again. This time it didn’t roll away. So I tried moving it up and down the driveway to different spots but the truck just held. You could feel the tension in the drivetrain. Finally it did it again. It was holding and then just released and rolled down the driveway. All of this was while facing downhill in reverse. This almost feels like electronic hill start or hill hold. I got the immediate sense that something is turning off in the transmission that then releases to truck to roll away. It feels like hill start assist. I wasn’t aware that it works in reverse. I don’t think this is related to the clunk. Of course this still begs the question why only at certain places on the driveway. I’m thinking this may be at the point where it’s at 8% grade, but who knows. I would never let reverse hold the truck in lieu of park and get out anyway

Hill Start is activated depending on the degree of inclination. Hill Start also does not activate if your truck has the parking brake up.

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[JTGuy]

This will become an issue when we actually have a failure. A random clunk from driveline bind is not a big deal to me. Mine will not be the first to fail if this is headed this way.

 

[Wolf Island Diver]

Hill Start is activated depending on the degree of inclination. Hill Start also does not activate if your truck has the parking brake up.

Correct. It’s 8% according for the auto according to some other forum. And that might very well be why it the truck was held and then released. It still a bit strange that these were tiny changes to the trucks placement on the driveway and it went from the transmission holding itself to being unable to that with such a small amount of a change.

 

[Wolf Island Diver]

This will become an issue when we actually have a failure. A random clunk from driveline bind is not a big deal to me. Mine will not be the first to fail if this is headed this way.

Exactly. I haven’t DM’d Jeep Cares because there’s no known actual problem beyond the noise, let alone documented root cause, let alone fix. I can imagine taking this to the dealership and getting the same “could not replicate” or “operating normally” response and wasting an afternoon.

 

[RP99]

Hey all,

New here and I'm hoping I'm not brining up anything that hasn't been beaten to death.. But I'm not finding anything that is mimicking what I'm experiencing exactly.

I'm seeing the same P to D and P to R and every which way around, clunk that everyone else is seeing.. Seems to be worse in incline or decline.

I'm also experiencing a really bad harmonic clunk on decel. It happens at all speeds, but actually has a moment of disappearance at the shift point.. I've seen many people say they have issues at the shift, where mine goes away. I've noticed is extremely severe while going down hill, or pulling a small trailer. I can get it to NOT happen if I switch to manual mode and keep the RPMS high.

While on flat ground in park, I can rock it forward and rearward and duplicate the sound and feel, but can't say if it's all in the rear diff, transfer case, transmission, or just a combination of everything stacking up.

Pulled the rear diff cover off and the spider gears have more play to them than I would have anticipated.. but that's as far as I've made it so far.

I want this fixed before warranty expires.. but also don't want the run-around at the dealership.. I'm at the end of my options, and will likely be taking it soon. My biggest fear is that I use it as leverage to get into a rear locker, and it doesn't fix it.. then the next time I want to upgrade because something "broke"... the Mrs. won't believe me.

 

[Gren71]

fwiw

I was reminded about using the parking brakes when i park. Ive been doing this and haven’t had the clubk i have had for 90,000 miles…not once…?‍

 

[JTGuy]

I'll try setting the hand parking brake but I am giving it little hope to stopping the clunk in the morning as I park in a level garage.

 

[MrBones]

Only happens when parked on an incline if my parking brake isn't cinched up real tight. My driveway slope is about 3 degrees (5%) according to off road pages. My parking brake needed adjustment but I guess it needs a few more turns.
FWIW it happened on my JKUR and that went over 80,000 miles without a problem before I traded it for the JTM..

 

[JTGuy]

It does it one time only then the rest are all OK..

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