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SYE?


 
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cemcdoc
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Joined: 26 Jun 2005
Location: Utopia, TX

PostPosted: Mon Jul 11, 2005 7:47 pm    Post subject: SYE? Reply with quote

Is the sye kit a stronger design than the stock configuration or just a means of eliminating vibration. I have 2500 miles on my 4.5 inch rough country lift and a one inch transfer case drop with no vibration at any speed. Is the sye still somthing I need or should I wait until I notice a problem?
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ThePhantum
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Joined: 23 Jan 2004
Location: I knew it...I'm surrounded by Assholes!

PostPosted: Mon Jul 11, 2005 9:38 pm    Post subject: Reply with quote

It's stronger in the sense that the replacement driveshaft will (usually) incorporate better u-joints than the stock ones. The main purpose of an SYE though is to reduce driveline angles.

The phrase "t-case drop" is actually misleading. What you are doing is lowering the transmission crossmember, and thus the entire tailcone of the transmission. This angles the the engine/tranny towards the rear pinion helping to reduce driveline angles somewhat. The downside is that by lowering the crossmember, you are giving up ground clearance. Also, the more you lift, the further the yoke is pulled out of the t-case (for some of the early model XJ's, pre-90 I think, you can get longer yokes which eliminate this...they do not do anything to help with vibrations though). These are the reasons that t-case drops are stop gaps and SYE's are long term solutions.
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cemcdoc
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Joined: 26 Jun 2005
Location: Utopia, TX

PostPosted: Tue Jul 12, 2005 5:16 pm    Post subject: Reply with quote

Thanks for the info. One thing I don't like about the transfer case drop is that the exhaust hanger is located on it also and it put the exhaust in a bind. The new rough country kit did come with longer shakles instead of blocks and that did help to improve the angle it would seem.
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Huey
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Joined: 18 Nov 2004

PostPosted: Tue Jul 12, 2005 10:47 pm    Post subject: Reply with quote

i too have the 4.5" RC lift and ive prolly put nearly 6k miles on it, and theirs is no vibes until i hit around 65..im really wanting to lift it 2" and put some cut out flares on their and try for some 35's in the future, what could i do to get the extra 2" of lift, and after this would a sye/drive shaft be necessary?
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