Ice in Transfer Case- Clicking/clunking under acceleration
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