T-Case "Chatter"

WarrensD · Mar 1, 2007

I took the D to the drop shop yesterday, for the "final" modifications, and we noticed that there's some chatter coming from the transfer case, when idling in park. I think this slowly developed about three months ago, but it was so gradual & subtle, I had to stick my head under the truck to really notice it.

I've searched the threads, but I don't really find an exact match. The T-case has had regular PM, & exhibits no other obvious symptoms.

Any ideas? TIA!

DurangoPaul · Mar 1, 2007

In park, there's nothing moving inside the transfer case, I think the noise may be carrying from somewhere else.

WarrensD · Mar 1, 2007

DurangoPaul said:
In park, there's nothing moving inside the transfer case, I think the noise may be carrying from somewhere else.

That's what I was thinking, too.

dizzyD · Mar 1, 2007

I have a friend that had a CAT go out, at first he thought the torque converter was bad when he heard that noise.
Just an idea :?

MWeed · Mar 1, 2007

The t/case is chain driven between the input and output to the front driveshaft. The chain could have stretched enough to be rattling in the case. Not an uncommon happening. Usually not noticed until the case comes apart, either for maintenance or because it blew out.

WarrensD · Mar 1, 2007

MWeed said:
The t/case is chain driven between the input and output to the front driveshaft. The chain could have stretched enough to be rattling in the case. Not an uncommon happening. Usually not noticed until the case comes apart, either for maintenance or because it blew out.

That makes sense! I'm going in in a couple of weeks for the install of the new tranny pan & rear diff cover. I'll have it looked at then?Thanks, Mike!

dizzyD · Mar 1, 2007

MWeed said:
The t/case is chain driven between the input and output to the front driveshaft. The chain could have stretched enough to be rattling in the case. Not an uncommon happening. Usually not noticed until the case comes apart, either for maintenance or because it blew out.

But that should only happen when in drive and moving, right? He's in park when the noise happens.

rapidrob · Mar 1, 2007

dizzyD said:
I have a friend that had a CAT go out, at first he thought the torque converter was bad when he heard that noise.
Just an idea :?

I'll 2nd this? I had the internal parts of a cat break loose on me awhile back and it was causing a rattle sound that that was very hard to pin-point. And, it was more noticeable while the engine was at idle. I thought I had tranny probs for awhile, but finally discovered it was the cat when it started throwing intermittent O2 sensor MIL codes.

DurangoPaul · Mar 1, 2007

WarrensD said:
MWeed said:

The t/case is chain driven between the input and output to the front driveshaft. The chain could have stretched enough to be rattling in the case. Not an uncommon happening. Usually not noticed until the case comes apart, either for maintenance or because it blew out.

Click to expand...

That makes sense! I'm going in in a couple of weeks for the install of the new tranny pan & rear diff cover. I'll have it looked at then?Thanks, Mike!

I was going to suggest that the chain has stretched and that eventually it'll slap the case, but then I realized that he stated "while in park" so there's no torque being applied to the Tcase input shaft, and if it's not moving, there's no torque being applied to the output shaft by the driveshaft, therefore nothing inside the Tcase should be moving. Has to be something else.

TheDodgeGuy · Mar 1, 2007

Rap on the cat with a rubber mallet and you'll probably hear the noise you're hearing when it's idling.

We just replaced one on a customer's Explorer that another (not so reputable) shop diagnosed as a tranny problem.

MWeed · Mar 2, 2007

If the chain is loose it could be hitting the case just from vibration. Mine cut the case in half when it went. The tow truck driver didn't want to tow it with just a wheel snatch set-up because it'd "damage the front diff and the transfer case". I had to show him that there was no connection between the driveline and the transfer case to cause damage.

T-Case "Chatter"

WarrensD

DurangoPaul

WarrensD

dizzyD

MWeed

WarrensD

dizzyD

rapidrob

DurangoPaul

TheDodgeGuy

MWeed

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