Ice in Transfer Case- Clicking/clunking under acceleration - JeepForum.com
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Unread 01-19-2013, 10:17 AM   #1
R32R1
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Ice in Transfer Case- Clicking/clunking under acceleration

Hey guys,

Alright so before we jump to CV, I have come up with a theory to why only on cold days and only when the vehicle is cold, I get a clicking/ clunking sound under 50% throttle and above directly under my feet. This leads me to believe its transfer case related. Now my case is wet, which is a good indicator that I need fluid, but is it possible moisture has built up enough to form ice?

This only happens when cold. I took it to the transmission shop and we couldn't repeat the noise. My second guess was transfer case chains, but if that theory were correct, it would be WORSE under warmer vehicle temps from the chains expanding.

The best analogy I can provide is pretend you're riding a 21 speed and are frantically pedaling. You change gears and that louder 'jump' of teeth sound happens because you're still hammering down on the pedals while changing gears. That's what the sound is under my feet.

Any input is appreciated.

Pic for reference. 2" RC w/ 265/70-17 Duratracs

img_20130107_172415.jpg  
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Unread 01-19-2013, 10:33 AM   #2
JeepN4KC
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Quote:
Originally Posted by R32R1 View Post
Hey guys,

Alright so before we jump to CV, I have come up with a theory to why only on cold days and only when the vehicle is cold, I get a clicking/ clunking sound under 50% throttle and above directly under my feet. This leads me to believe its transfer case related. Now my case is wet, which is a good indicator that I need fluid, but is it possible moisture has built up enough to form ice?

This only happens when cold. I took it to the transmission shop and we couldn't repeat the noise. My second guess was transfer case chains, but if that theory were correct, it would be WORSE under warmer vehicle temps from the chains expanding.

The best analogy I can provide is pretend you're riding a 21 speed and are frantically pedaling. You change gears and that louder 'jump' of teeth sound happens because you're still hammering down on the pedals while changing gears. That's what the sound is under my feet.

Any input is appreciated.

Pic for reference. 2" RC w/ 265/70-17 Duratracs
What are you talking about?
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Unread 01-19-2013, 12:11 PM   #3
R32R1
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Originally Posted by JeepN4KC View Post
What are you talking about?
1. The sound occurs when pressing the gas pedal over half way (50% throttle)

2. When looking under the truck, I notice the transfer case is wet (fluid leaking, but no puddles anywhere. My WJ had that problem too, but it is an indicator there is a possibility the level is low)

3. Today it's 47 degrees out and no noise at all. This is making me fall back to my theory that there's ice in my transfer case since the outside temp is above freezing.

To make myself sound less crazy, my theory is backed by the fact there's 140k miles and a potential low fluid level in the transfer case. Is there a possibility that over the years, some sort of condensation has built up enough to form ice inside of the transfer case where it's at a noticeable point? I'm going to change the TC fluid and ATF this week to see if it does anything. Although at this point, I'm a little hesitant in changing the ATF due to the mileage on the truck and the hype that older trannys like dirtier fluid.
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Unread 01-19-2013, 01:27 PM   #4
JeepN4KC
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Your theory isn't backed by anything that you've presented so far.
Condensation or ice inside the t-case?
Transfer cases and transmissions like dirty fluid?
Has your Jeep been submerged in water as deep or deeper than the t-case?
Have you ever drained and refilled your t-case oil?
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My Build Thread WK
My Other Build Thread XJ
'01 XJ with some stuff
Sept 2013 Cherokee of the Month
'07 WK with some other stuff
~RED WK CLUB #7~
'11 KK with mostly stock stuff
'06WK our first Jeep with stock stuff - totalled and gone
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Unread 01-19-2013, 02:28 PM   #5
LouC
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I think you better change the fluid right away and look for the leak while you are at it.
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Unread 01-19-2013, 03:31 PM   #6
R32R1
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Quote:
Originally Posted by JeepN4KC View Post
Your theory isn't backed by anything that you've presented so far.
Condensation or ice inside the t-case?
Transfer cases and transmissions like dirty fluid?
Has your Jeep been submerged in water as deep or deeper than the t-case?
Have you ever drained and refilled your t-case oil?
No, it hasn't been submerged in water that deep. It was a shot in the dark, but I'm getting the fluids changed this week. Hopefully that fixes it.
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