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Old 04-01-2013, 12:33 AM   #1
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help with sye +

i just finished installed RCs high clearance skid plate, 1" motor lift, 1.25" body lift, sye, rear CV driveshaft... everything went in farely easy. my problem occurred once i started it after the installation of everything and took it on a test drive.

When i start the jeep there is a non steady knock coming from the tcase. when i accelerate to 35 mph it turns into a vicious vibration.. i have read that this signifies a loose chain but before i buy one.. i thought i'd ask around see what other people think.
i have a 05 TJ 4.0 6 speed trans. 32k miles with the 231 j tcase.

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Old 04-01-2013, 03:43 AM   #2
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Did you put adjustable upper control arms on to set your pinion angle?

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Old 04-01-2013, 08:21 AM   #3
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I suggest you download a parts breakdown of the transfer case to make sure everything is in the right place. I've just installed a SYE, driveshaft and control arms on my TJ with no issues. I did change the chain due to mine was stretched had a 155000 miles on it. I also rebuilt the transfer case with new bearings and seals.
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Old 04-01-2013, 09:22 AM   #4
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no i didn't put adjustable arms.. the angle didn't seem bad at all. i wouldn't think i would have to change my chain due to the low miles on the jeep (32k). but i will crack it back open and look around. i'll let ya know what i find. if anything
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Old 04-01-2013, 09:32 AM   #5
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Did you adjust the pinion angle at all? What control arms are you running?
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Old 04-01-2013, 10:00 AM   #6
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stock arms
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Old 04-01-2013, 10:12 AM   #7
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Thats your problem, you can't run an SYE/drivehsaft without adjustable arms. The pinion angle has to be adjusted.

How the stock shaft setup looks


How a setup with SYE and SV shaft should look


You need to get adjustable rear upper control arms and adjust the pinion angle of the rear differential to point at the output shaft of the transfercase.
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Old 04-01-2013, 10:21 AM   #8
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Quote:
Originally Posted by homebrwd View Post
Thats your problem, you can't run an SYE/drivehsaft without adjustable arms. The pinion angle has to be adjusted.

How the stock shaft setup looks


How a setup with SYE and SV shaft should look


You need to get adjustable rear upper control arms and adjust the pinion angle of the rear differential to point at the output shaft of the transfercase.
Yep. You can't run an sye/cv without at least adj. rear UCA's. Rear adj. lowers are a good idea too if you can afford them at the same time.
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Old 04-01-2013, 10:27 AM   #9
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so what exactly is the knocking i'm hearing?? it's coming from inside the tcase.
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Old 04-01-2013, 10:30 AM   #10
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so what exactly is the knocking i'm hearing?? it's coming from inside the tcase.
Just a thought, it could be coming from the rear of the t-case because the cv joint isn't at the correct angle.... I'd get some CA's quick and see if that fixes the banging.
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Old 04-01-2013, 10:31 AM   #11
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As a test you could remove the rear shaft.. put the Jeep in 4High.. and see if the t-case still makes the same sounds/problem.
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Old 04-01-2013, 10:35 AM   #12
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that may be true but it doesn't explain the random knocking.. it's not a steady knock> . . . . . . . . . it's like .. . .... . . . . . .. . . . .. (just a guesstimate) i'm trying to upload a video of it
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Old 04-01-2013, 10:36 AM   #13
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As a test you could remove the rear shaft.. put the Jeep in 4High.. and see if the t-case still makes the same sounds/problem.
alright ill try that
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Old 04-01-2013, 10:51 AM   #14
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You are putting bad angles on your driveshaft which connects to the transfercase, the transfercase is now seeing forces at angles its not designed to see and its unhappy about it. Fix the angle first and see if your knock still exists.

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