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Old 07-25-2013, 09:19 AM   #1
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Yj drive shaft angle

Does this look right to you guys?

i was under the car yesterday and i told myself it looks like the angle is way to extreme.

Can you please let me know if this is weird, it drives ok but my mechanic told me he was going to find out and i figured i would be able to find out first here!

Untitled | Flickr - Photo Sharing!

Sorry i cant actually stick the photo in from flickr...

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Old 07-25-2013, 09:46 AM   #2
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Yea that's pretty extreme. 3 ways to fix it,

1- put a TC drop. Most say this is temporary fix for the angle a better fix would be #3
2- install axle shims to raise the rear drive shaft flange to lower the angle.
3- install SYE
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Old 07-25-2013, 10:12 AM   #3
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ok shims seem to be the easiest solution i can think of considering the limited options i have out here.

do you think its dangerous to drive as it is? and also do you think if i combo some custom made shims with a TC drop it would fix the problem?
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Old 07-25-2013, 10:14 AM   #4
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its honestly been the worst month ever for my jeep
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Old 07-25-2013, 10:23 AM   #5
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That will probably do it (tc drop and degree shims) depending on your lift . Driving it like it is will give you tons go vibrations . Definitely wouldn't take it off road like that . Your yoke is out pretty far . What size suspension lift do you have? The Rubicon Express 4.5 lift comes with a tc drop kit and axle shims . I ran that lift with those parts before and was fine off that height , even off-road . IMO people would support that going any higher would warrant the need for SYE and cv driveshaft as well as raising the pinion angle .
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Old 07-25-2013, 10:26 AM   #6
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the thing is i found out the PO cut his leafs and did a shitty custom lift instead of buying a kit, which is now leading to all these extra problems, inlcuding shocks that are way too streched and now falling out, and this axle shaft issue...

What is an easy way of finding out how much of a lift it has?

and also how much of an angle do you think the shims would need to be?
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Old 07-25-2013, 10:39 AM   #7
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Do your shackles look stock ? Are your leaf springs flat ? You can do this , take a string tie one end to your driver or passenger side main eye bolt ( the one on the frame , center of vehicle ) pull it tight to the other end of the spring where it bolts to the shackle and tie it tight to the shackle bolt . Make sure it's tight . Then measure the distance between the spring (middle ) and the string ( above where the spring perch is on the axle) . If your jeep is Soa , which by your avatar doesn't look , automatically ad 5.5 inches .
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Old 07-25-2013, 10:41 AM   #8
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Cut the leafs ? Hmm I don't understand . pics? Try and use photobucket to post pics
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Old 07-25-2013, 11:03 AM   #9
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ok when i get to the car, im going to get a clear pic of the leafs and the shackles.

Ive also emailed the PO and explained the issues im having and asked him how much lift it has... and to bitch a little at the piss poor job he did... also kicking myself for buying it with these issues.

the problem is where i live in nicaragua is all off road as there is no paved road...
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Old 07-25-2013, 11:21 AM   #10
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was also just thinking i had this happen also will having a broken shock at the time of the picture have an effect on the angle of the shaft?

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Old 07-25-2013, 12:03 PM   #11
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Just found out it has a 2.5 inch lift.

they arched the original leafs by cutting them and replacing the 2nd leaf, is what he said in the email.

Will putting higher shocks do anything for the angle? i have to change all 4 as they are super streched and not actually doing anything for the suspension as is...
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Old 07-25-2013, 12:18 PM   #12
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Lets go back to the beginning. Measure from the floor to the frame at the drivers door. Stock with stock tires measures 18". You will find you are probably a lot higher than just the 2.5" lift they say you have.

Technically your angles look not too bad but take a closer look. The slip yoke is hanging out the back of the output shaft and is slid back which will put more stress on the yoke and may break on the trail. When your suspension flexes it may just come off.

From the picture regardless of numbers for lift you need to either do an SYE and double Cardin shaft or drop the lift.

It has bad all over it and you will hear people sya they do 4" lift with an SYE and have no problems bull s%$#. That shaft will break or come off at full flex when wheeled hard enough.

I know this stuff is expensive and takes a few hours to install but the best solution for your picture is an SYE and new shaft. Once that is installed you can get a magnetic angle finder and figure out how much in degrees wedge you need in the spring stack. Sorry to be the bearer of bad news but that is my take and that is what I faced with mine last year. Once I learned the pinion angle game I was good to go.
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Old 07-25-2013, 12:43 PM   #13
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so im running 33's with the 2.5 inch lift, i feel like i have alot of space to drop it and keep the 33s, what would be the easy way of dropping it?

My big problem is that living in central america its hard to get these parts here, so if it means dropping the jeep a little to fix the problem i would rather do that, do you think if we do a drop i can still use the same shaft?

Thanks for the detailed response from everyone, this is way past my knowledge and im having a hard time understanding the geometry and how the whole thing works.

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Old 07-25-2013, 01:42 PM   #14
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Go to google and search for Tom Woods Driveshaft. On the page halfway down right center grey banner labeled Technical Information and Sponsorships. Open that and there is more than you want to know about driveshafts and geometry. Great read and should answer all your questions
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Old 07-25-2013, 01:57 PM   #15
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You need a SYE unless you just want to lose the driveshaft

In my opinion
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Old 07-25-2013, 02:20 PM   #16
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wow thats alot of information...

again i just want to make sure i get the options... SYE, shims and a tc drop or just drop the lift to get it back to regular geometry?

does that sound right?

Also when you say i need a SYE, can i just get that part or would i also need a new shaft? im having a hard time putting together what parts i would need to figure out how much this would all cost.

I dont neeeeeed to be lifted if dropping it solves the problem i feel like i might do that instead.

Sorry for all the insecure questions but i dont have a clue and also worried because every option that includes buying a bunch of parts i have to factor in the cost to get them to Nicaragua...
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Old 07-25-2013, 02:50 PM   #17
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With SYE yea you need a new shaft. Yes removing the lift will solve for the issue and put everything back to Its normal geometry. But can't be positive that he did just springs, are the shackles stock?
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Old 07-25-2013, 02:57 PM   #18
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i think they are but ill take a pic of them later to be sure.

I think all they did was lifting it with modified leafs, thats why the shocks/springs are so high, when i say hi i mean the bottle is super stretched like their about to come out, to me that seems to show they lifted the leafs and nothing else, which would screw everything up right?

So about $600 bucks plus shipping and installing...
or
put everything back down to stock...

dont like the options that much, ease for me would be dropping, but fun with the jeep would be spending the money on her.
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Old 07-25-2013, 04:33 PM   #19
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Option #1 If you plan to upgrade with a cv driveshaft by all means do it . Tom Woods cv drive shaft is about 350 shipped in us . If you do that then you might as well to a slip Yoke eliminator too , about 240 plus shipping . Depending on if you can put it in yourself will depend on installation fees . So you will be in about $600 ballpark to get yourself straight .

Option #2 Now , with 2.5 inched of lift ... CV driveshaft is not needed , even off road . If you don't plan on going higher don't waste your money . If you want to keep your 33's you really can't go lower .

A transfer case lowering kit ... http://www.quadratec.com/products/16301_4480.htm , with rear axle degree shims ... http://www.quadratec.com/products/16311_512X_A_PG.htm . Will fix your problem , save your drive shaft and give the capability of off road driving all under $80 without shipping . If you have the cake do it right the first time with option 1
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Old 07-26-2013, 10:07 AM   #20
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the plan right now is switching out all the shocks and dropping the custom lift that they did, im gonna show you guys how ridiculous it is, they just added a deeper leaf and added it to the original leafs to get the lift...

then i will buy a proper lift kit like normal people and repeat the process properly including the cv driveshaft to make sure this never happens again...for a while...

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