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Old 04-18-2010, 02:52 AM   #1
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Stock rear drive shaft with 4-6" of lift

Hey guys, so i have a 4" RC lift on my YJ and also some lift shackles. Looking at the drive line nothing is binding, but at slow speeds [like taking off from a stop] the rear of my jeep kinda shakes a bit. its only from 0-2mph if that. It does not do it in reverse and it is smooth at all other speeds. Im thinking it just might be a ujoint. what do you guys think? I know i should get a SYE and new rear driveshaft but it has a 2.5L and it doesnt really get beat on.

-Eric

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Old 04-18-2010, 04:06 AM   #2
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That happens to me some times on starts after my engine has warmed up, My clutch gets really loose and its hard to ease it on while starting off.

Does it happen to you all the time or just on hills, while the engines hot, ect..?

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Old 04-18-2010, 09:17 AM   #3
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Same here only in first but tends to happen once I have been driving a while and pulling a load... Deff my clutch, will start to bounce a bit I have to push the clutch in and let it a few time out to get er going.
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Old 04-18-2010, 10:29 AM   #4
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Same thing happens to me when pulling a load or starting up a hill from a complete stop.... so are you all saying this IS probably an issue with the clutch? Mine has been doing this since I got a new engine installed a few years back and also got the guy to install a new clutch. I figured the guy just didn't install my clutch right or something, but everytime I took it to him so he could see/hear/feel what it was doing it wouldn't do it so I've learned to live with it....I hate it though since I pull a trailer often. Mine is a TJ but I frequent this area often and for the most part, ours are the same anyway regarding engine and drivetrain. Hopefully someone can shed some light on this problem and give a possible solution.
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Old 04-18-2010, 10:47 AM   #5
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i doubt anyone that replied is running a 5" or so lift with a stock drive shaft. you know you need sye and cv shaft. your set up is not ok without it. fix what you know needs to be fixed, instead of skipping over it and chasing a problem in directions you don't need to yet.
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Old 04-18-2010, 10:49 AM   #6
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sorry forgot to mention its an auto, so no clutch problems lol. im pretty sure its just a u joint in the rear ds. i sat under it this morning and there is a tiny bit of play. Just a quick question when i pull the rear driveshaft does it just pull out of the t-case?

-Eric
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Old 04-18-2010, 04:51 PM   #7
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Yes, the driveshaft does just pull out of the transfer case. Be ready to catch the fluid because it will come out. Jpdoc is right. You really need to be running an sye(slip yoke eliminator) kit & a cv driveshaft. I assume you are at least running a t-case drop; but if you are over 4" of lift you really need the sye kit. Your u-joint is probably being eaten by the extreme driveline angle. If you change it now you will most certainly be changing it again.
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Old 04-18-2010, 09:16 PM   #8
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Thanks, Im gonna replace the ujoints for now. I've been looking at SYE kits for a while because i know the jeeps only getting taller. haha. I do have a t-case drop and my drive line angles are not ideal but they arnt threatening either. I had it out on the trails today and had noproblems.
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Old 04-18-2010, 09:45 PM   #9
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Quote:
Originally Posted by EricRanger View Post
I do have a t-case drop and my drive line angles are not ideal but they arnt threatening either. I had it out on the trails today and had noproblems.
i'm not jumpin on ya here, but you may wanna listen to the people that know whats going on, your driveline angle is threatening, its not right, you will replace u joints again prematurely. and you are not gonna have as many problems on the trail as you will on the street most of the time, believe it or not. the drive shaft is gonna get hotter, and is affected more when its running down the road at speeds. and obviously if it did completely bind when flexed on the trail it can just snap. but your condition sounds more like bad angle and street driving.
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Old 04-18-2010, 10:21 PM   #10
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Thanks for the input. I start my new job this week, so ill do ujoints now and order an sye kit and new rear cv drive shaft soon.

-Eric
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Old 04-20-2010, 08:18 PM   #11
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this is how it is now


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