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Old 01-02-2014, 11:06 PM   #1
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Scratchy transfer-case noise

An annoying scratchy sound is coming from my transfer-case only at high speeds. At first I thought it was my transmission because it primarily happens in 4th and 5th gear. But upon closer inspection (me getting underneath the Jeep with the trans in gear and t-case in neutral) it is in fact coming from the t-case. When it's rolling down the road anywhere above 40mph, it only occurs when I apply the gas, sometimes even making more noise the less I apply the gas. A friend says it's the transfer-case chain that's causing all the racket. Is he on to something? Or is it a different problem that someone could enlighten me in?

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Old 01-02-2014, 11:18 PM   #2
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Did you drain it after your profile pic? it could be but that chain functions regardless of gear and speed. If I was to make noise I would do it progressively from 0 to 55 if I was the chain. If it happens in only 2 gears sounds like you narrowed it down.

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Old 01-02-2014, 11:21 PM   #3
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Did you drain it after your profile pic? it could be but that chain functions regardless of gear and speed. If I was to make noise I would do it progressively from 0 to 55 if I was the chain. If it happens in only 2 gears sounds like you narrowed it down.
Haha yes, all the fluids have been changed since the pic Wouldn't it bemore prone to make more noise in higher gears since it'd be spinning faster in higher gears?
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Old 01-02-2014, 11:23 PM   #4
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Did you drain it after your profile pic? it could be but that chain functions regardless of gear and speed. If I was to make noise I would do it progressively from 0 to 55 if I was the chain. If it happens in only 2 gears sounds like you narrowed it down.
And it primarily* happens in 4th and 5th. It also does it in 3rd and sometimes 2nd. It's all relative to the speed it seems. It's just much more noisy in 4th and 5th.
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Old 01-02-2014, 11:30 PM   #5
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Well yes. Now we are traveling far from narrowing it down though. Any mechanical part that makes noise should be louder at a faster speed.
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Old 01-02-2014, 11:33 PM   #6
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Well yes. Now we are traveling far from narrowing it down though. Any mechanical part that makes noise should be louder at a faster speed.
Yes, the only reason I notice it more in 4th and 5th gear is because I very rarely drive around at 45-60mph in 2nd or 3rd gear. Lol
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Old 01-03-2014, 03:22 AM   #7
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I suppose I'll just crack it open and see how the chain's doing. The bearing seems fine as far as no excess movement. Not sure about inside of it though.
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Old 01-03-2014, 04:21 AM   #8
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Does it stop in 4wd?
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Old 01-03-2014, 11:13 AM   #9
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Does it stop in 4wd?
Everything works perfectly in 4-high and 4-low!
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Old 01-03-2014, 11:15 AM   #10
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Everything works perfectly in 4-high and 4-low!
Only because I'm not going fast enough in 4 for the noise to occur, it only happens once I get above 40-ish.
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Old 01-03-2014, 12:04 PM   #11
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Could you post a video of the sound?
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Old 01-03-2014, 12:09 PM   #12
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Yeah sure!
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Old 01-03-2014, 01:08 PM   #13
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Strange sound coming from t-case/trans on Wrangler - YouTube
Here it is. You'll have to have the volume up and listen carefully.
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Old 01-03-2014, 02:18 PM   #14
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And this just started? These transmissions are loud and while mine does also make noise like that when the gears are turning fast, its hard to tell if yours is normal in the video..
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Old 01-03-2014, 05:02 PM   #15
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And this just started? These transmissions are loud and while mine does also make noise like that when the gears are turning fast, its hard to tell if yours is normal in the video..
It's been doing it for a good while. I used to just go away a day after rides. But now it does it regardless. Yeah sorry, it's pretty hard to tell in the video but when driving it's easy to tell.
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Old 01-03-2014, 05:51 PM   #16
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Well, I can tell from the video that it is not the chain in the transfer case. Because the chain does NOT spin when the T case is in NEUTRAL. It is either the trans or the input bearings to the T case. Good luck and tell us what you find.
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Old 01-03-2014, 08:17 PM   #17
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Well, I can tell from the video that it is not the chain in the transfer case. Because the chain does NOT spin when the T case is in NEUTRAL. It is either the trans or the input bearings to the T case. Good luck and tell us what you find.
Would there be anything that would make it easier to diagnose it as something with the transmission?
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Old 01-03-2014, 09:41 PM   #18
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Well, after closer investigation I've learned that it's not the sound in the video I'm hearing on the road, it's more so a sound coming from the rear. So we're going to tear down the rear end tomorrow and see what we find!
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Old 01-03-2014, 09:44 PM   #19
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Good luck man. Sounds like a cheaper fix at least. Don't forget drums full of shiitake can be noisy
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Old 01-04-2014, 12:03 AM   #20
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Good luck man. Sounds like a cheaper fix at least. Don't forget drums full of shiitake can be noisy
Yeah hopefully! I'm hoping I don't pull the cover and find a nice metal shaving soup!
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Old 01-04-2014, 10:16 PM   #21
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You guys won't believe what I found...wow...
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Old 01-04-2014, 10:20 PM   #22
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And?
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Old 01-04-2014, 10:29 PM   #23
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I managed to warp the carrier to the point where the spider gears are rubbing into it... They actually rubbed a hole into the carrier! Mind you that this is a Dana35! I'm amazed that I managed to warp the carrier and not snap a shaft!
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Old 01-04-2014, 10:47 PM   #24
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Good to hear what your noise was. Glad you can fix it before it exploded!!!
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Old 01-04-2014, 11:01 PM   #25
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Good to hear what your noise was. Glad you can fix it before it exploded!!!
Oh it's going to explode. I have an 8.8 on waiting that I'm going to swap in, so I just put some el-cheapo gear oil in it until it does happen.

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