At what lift height do I need an SYE/CV Driveshaft? - Jeep Wrangler Forum
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Old 04-01-2010, 05:35 PM   #1
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At what lift height do I need an SYE/CV Driveshaft?

I've heard some people say 4", others say 5", and I've also heard 6".
What's the deal?

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Old 04-01-2010, 05:39 PM   #2
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The rule is 4 and above. Some get away without a SYE and shaft with 4 iches with a one inch motor mount lift and a transfercase drop.

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Old 04-01-2010, 05:41 PM   #3
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Well I'm looking at a Rubicon Express 3.5" lift, but that's basically 4", so would I need it?
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Old 04-01-2010, 05:44 PM   #4
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I heard a rule of thumb for the RE lifts is to expect one inch more then whats advertised so you might be able to get away with a TF drop and a motor mount lift but dont hold my words to it. But to do it the RIGHT way in a PERFECT world where money isnt an issue a SYE and shaft is the way to go!
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Old 04-01-2010, 05:45 PM   #5
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the lowest I've heard is 4" as well. If I were you I'd put the lift on drive around a while to see if you're getting any vibes, then get a SYE & CV if needed. my $.02
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Old 04-01-2010, 05:51 PM   #6
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Unless you have an LJ . . . most of the time, anything much over 2" is going to cause vibes, which is why most 2.5" and 3" kits come with a TC drop kit. As mentioned a RE 3.5" is really a 4" kit, so to do it right, you should go with the SYE and CV DS . . . along with all the other stuff you need like a CV TB bracket, adjustible rear UCAs, etc.
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Old 04-01-2010, 06:13 PM   #7
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Quote:
Originally Posted by Oswald View Post
Well I'm looking at a Rubicon Express 3.5" lift, but that's basically 4", so would I need it?
Yes, you should definitely have a SYE and CV driveshaft for that tall of a lift. A great source for both of those is Tom Wood at www.4xshaft.com/ who is a long-term supporter of the Jeep community.

Only an Unlimited can go to 5" without an SYE kit.

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