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Old 10-11-2013, 08:52 AM   #1
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frustrated...Sye and cv

ok, so i know that this question has been asked a million times, but i still don't understand so bear with me.
I just completed a ZONE 3" suspension lift with TC drop. The rig came with a 3/4" bl. Post install i noticed that the drive line wasn't nearly has smooth. Basically, i'm feeling a vibe in my steering wheel through gears 1, 2, and 3 for about the first 3-5 seconds. Once i get to a higher RPM range in each gear, that torquey-ness seems to diminish. To correct this, i install a Brown Dog MML and removed the TC drop. Unfortunately, i'm still feeling the vibes. I've check my driveshaft (front and rear) and they feel tight. No unusual play or movement. i don't hear any clucking when i drive or go over rough spots in the road. The thing is, i know it's not running at optimal performance and that pisses me off. So now i'm considering dropping MORE money and doing the SYE and CV. I've spent a little time on the Tom Woods site and am thoroughly confused. Where do i start? what do i look for? do i need both SYE and CV (from what I can tell CV addresses the front, SYE addresses the rear). Would pics of my current shaft angles help identify a problem?
Side note, since doing the 3" lift, it is harder for me to shift into each gear. However, the 4HI & 4LO shifter works flawlessly.
Just looking for a little direction.
1997 Sport / 4.0 / 149k miles

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Old 10-11-2013, 09:22 AM   #2
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Personally my next step would be to replace the drive line u joints and see if that resolves it.

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Old 10-11-2013, 09:26 AM   #3
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I like the way you think sir. It's actually on my weekend to-do list. Autozone sells these puppies for $15/ea. I'll try that and if it works, i'll gladly buy you a beer. If it doesn't correct the issues then you own me $30...it's only fair.
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Old 10-11-2013, 09:26 AM   #4
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ok, so i know that this question has been asked a million times, but i still don't understand so bear with me.
I just completed a ZONE 3" suspension lift with TC drop. The rig came with a 3/4" bl. Post install i noticed that the drive line wasn't nearly has smooth. Basically, i'm feeling a vibe in my steering wheel through gears 1, 2, and 3 for about the first 3-5 seconds. Once i get to a higher RPM range in each gear, that torquey-ness seems to diminish. To correct this, i install a Brown Dog MML and removed the TC drop. Unfortunately, i'm still feeling the vibes. I've check my driveshaft (front and rear) and they feel tight. No unusual play or movement. i don't hear any clucking when i drive or go over rough spots in the road. The thing is, i know it's not running at optimal performance and that pisses me off. So now i'm considering dropping MORE money and doing the SYE and CV. I've spent a little time on the Tom Woods site and am thoroughly confused. Where do i start? what do i look for? do i need both SYE and CV (from what I can tell CV addresses the front, SYE addresses the rear). Would pics of my current shaft angles help identify a problem?
Side note, since doing the 3" lift, it is harder for me to shift into each gear. However, the 4HI & 4LO shifter works flawlessly.
Just looking for a little direction.
1997 Sport / 4.0 / 149k miles
First, what kind of condition is your transfer case mount in? If it is separated at all, change it out. Normally drive line angle vibes are not felt so much through the steering wheel, but through the body (your seat, the center console, etc.) Have you had an alignment done (or done it yourself) since your lift?

An sye eliminates the slip yoke on the back of the transfer case and is used in conjunction with a double cardan drive shaft (on the rear) that looks similar to your front drive shaft (with double u-joints on the transfer case end and a single on the axle end). The drive shaft itself has a slip spline in the middle of it. Going with an sye is all positive, but expensive. You would also need at minimum, adjustable rear upper control arms, and an angled track bar bracket so the pinion angle can be rotated to the correct angle for the new drive shaft.
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Old 10-11-2013, 09:52 AM   #5
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Damn it water dog... you managed to educate and grenade my budget at the same time. i'm starting to think that fred flintstone had it right
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Old 10-11-2013, 10:06 AM   #6
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. i'm starting to think that fred flintstone had it right
I'm pretty sure this is true, but only if you can get your wife to drive...!
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Old 10-11-2013, 10:17 AM   #7
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Have you had an alignment done (or done it yourself) since your lift?
x2
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Old 10-11-2013, 11:04 AM   #8
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I like the way you think sir. It's actually on my weekend to-do list. Autozone sells these puppies for $15/ea. I'll try that and if it works, i'll gladly buy you a beer. If it doesn't correct the issues then you own me $30...it's only fair.
But when you replace them, stash the current good one somewhere in your Jeep. They might come in handy some day deep in the da woods for you or someone else with a TJ.

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