Ticking from trans/transfer case

acf6

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Manchester, CT
I was driving with my windows rolled down today since its like 50* in december and noticed when i took off from a stop sign, my truck was squeaking/chirping/ticking. combination of that... If i just let off the brake and let my truck roll it squeaks a little, but as soon as i give it throttle it gets louder and faster. Stops instantly if i let off the pedal, and it either does it up to 10mph or i cant hear it over that. Didnt do it revving it up in park either, or reverse

So i get home and jack up the front end, spin the tires, dont hear anything abnormal. Jack up the rear end, chock the front tires and put it in neutral and i went under and started spinning the driveshaft. Heard a ticking that got louder the closer i got to the trans, and the best i can determine is its coming from the rear of the trans. You can hear it pretty clearly in these videos, in the first one its pretty loud around :41 and the second video im on the opposite side of the trans and its even clearer. It doesnt seem to be coming from a u joint unfortunately

i know theres some background noise but if you turn your volume up and listen close you can easily hear it
http://www.youtube.com/watch?v=JOaFnZmOo5A&feature=youtu.be

http://www.youtube.com/watch?v=NmYrf-Bujrc&feature=youtu.be

I have no idea what this could be, or how long its been doing it, but it doesnt sound very good to me..what do you think? 130k on my truck, all maintenance is done on time or early, original trans/transfer case as far as i know
 
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