I am guessing I don't have an SYE??? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 11-22-2010, 06:26 PM   #1
Jeeper
 
LaterJim's Avatar
 
Join Date: Aug 2010
Location: Springboro, OH
Posts: 80
I am guessing I don't have an SYE???

So I took the tcase skid plate off to change the tranny fluid as well as try and clean some of the rust off. After wheelin last weekend I noticed that when I let off the gas around 45-55mph there was a harder vibration then the normal engine braking. I am not sure if I have a SYE, but from searching around I assume I do not. I have a 95 4.0L with a 4' lift. Should I have a SYE? I just think that the vibration is occuring as the rear diff pitches forward and the angle of the driveshaft is off...on the right track? Also, I didn't measure when I took the tcase skid off and assumed that when I remounted, it would return to the previous angle. Any thoughts on some tests I can do to figure out the issue. Other than the vibration the rig drives normal.


LaterJim is offline   Quote Quick Reply
Old 11-22-2010, 06:31 PM   #2
Jeeper
 
gennybro's Avatar
 
Join Date: Aug 2010
Location: shenandoa valley va
Posts: 135
what is an sye?

gennybro is offline   Quote Quick Reply
Old 11-22-2010, 06:34 PM   #3
Drives by Braille

WF Supporting Member
 
AzTJ's Avatar
 
Join Date: Dec 2006
Location: For-8-Oh!
Posts: 13,621
Nope, that would be the stock slip-yoke.

This is what an SYE would look like.
AzTJ is offline   Quote Quick Reply
Old 11-22-2010, 06:36 PM   #4
Jeeper
 
LaterJim's Avatar
 
Join Date: Aug 2010
Location: Springboro, OH
Posts: 80
Any suggestions on the vibration issue? Or whether I need a SYE?
LaterJim is offline   Quote Quick Reply
Old 11-22-2010, 06:46 PM   #5
Drives by Braille

WF Supporting Member
 
AzTJ's Avatar
 
Join Date: Dec 2006
Location: For-8-Oh!
Posts: 13,621
With 4" of lift, an SYE is probably a really good idea. You can also install a motor mount lift to help angle everything down to help out. They also make shims that go under the leaf springs to help point the pinion up too.
AzTJ is offline   Quote Quick Reply
Old 11-22-2010, 06:52 PM   #6
Jeeper
 
LaterJim's Avatar
 
Join Date: Aug 2010
Location: Springboro, OH
Posts: 80
Are you saying that I should do one of the three, or all of them? I have been looking at the SYE/CV...seems pricey and looks like its gonna cost about $600 in total. I feel like the vibration just started...weird. Thanks for the help.
LaterJim is offline   Quote Quick Reply
Old 11-22-2010, 06:56 PM   #7
Jeeper
 
floridajeep's Avatar
 
Join Date: Nov 2010
Posts: 74
I was looking at the 4" rough county and they said with the tcase lowering parts that i would not need to do anything else and no vibration,is this not true???
floridajeep is offline   Quote Quick Reply
Old 11-22-2010, 06:57 PM   #8
The Rogue Moderator

::WF Moderator::
 
Cons_Table's Avatar
 
Join Date: Aug 2009
Location: Ridgecrest, CA
Posts: 7,456
If you do the SYE and CV that will be all u will need. The MML and shims were just an alternative route.
__________________
Poor Boy Racing The definition of the EVERYMAN Challenge!

Everyman Challenge XJ Build
Cons_Table is offline   Quote Quick Reply
Old 11-22-2010, 07:10 PM   #9
Drives by Braille

WF Supporting Member
 
AzTJ's Avatar
 
Join Date: Dec 2006
Location: For-8-Oh!
Posts: 13,621
Quote:
Originally Posted by Cons_Table View Post
If you do the SYE and CV that will be all u will need. The MML and shims were just an alternative route.
Exactly.
AzTJ is offline   Quote Quick Reply
Old 11-22-2010, 07:35 PM   #10
Jeeper
 
LaterJim's Avatar
 
Join Date: Aug 2010
Location: Springboro, OH
Posts: 80
I can rotate the rear drivshaft with my hand a bit while the jeep is just sitting. Is that normal? The u joints look like they are in good shape. Kind of hard to tell from my original pick but there isn't any rust and look good. The vibration scares me a bit but since i don't already have a SYE/CV and have 1" hockey pucks to boot, i didn't have a ny problems before. I did get a puncture and put a brand new tire on, so there is one brand new one with 3 eight month old ones, so maybe the tread difference is causing it. Paranoia is setting in....
LaterJim is offline   Quote Quick Reply
Old 11-22-2010, 07:54 PM   #11
Jeeper
 
JEEPSTER988's Avatar
 
Join Date: Oct 2010
Location: Las Vegas, NV
Posts: 71
Images: 3
Check the motor mounts to the block and tranny mounts. If it vibrates when you let off of the gas, it seems doubtful to be the driveline, but possible. The driveline may move if your e brake isn't on. It shouldn't wiggle if that makes any sense. The driveline vibe is usually at steady speeds and it rolls through the entire vehicle. If it happens when you let off and brake it can be rotors or drums or bearings. Just a thought
__________________
JEEPSTER 988
SMASHIN JEEPS FOR LIFE !!!!!!!!!!!
JEEPSTER988 is offline   Quote Quick Reply
Old 11-22-2010, 08:09 PM   #12
Jeeper
 
LaterJim's Avatar
 
Join Date: Aug 2010
Location: Springboro, OH
Posts: 80
The vibe goes away if i am accelerating and only happens in gear when i left off the gas and let the engine slow the jeep down. so i would be in 4th gear going 50mph and let off the gas and the vibe sets in. doesn't vibe in any other gear (not any more than the normal feeling you get as the engine slows down)...maybe check the pinion angle? i am stumped
LaterJim is offline   Quote Quick Reply
Old 11-22-2010, 08:16 PM   #13
Jeeper
 
YJman's Avatar
 
Join Date: Sep 2010
Location: Connecticut
Posts: 988
You said you have a t-case drop? That's odd. If it's only in 4th gear, could it be something to do with the tranny?
__________________
Use Locktite, Or Kiss Your Nuts Goodbye!
Small like a CJ, better than a TJ!
☼ YJ â○⌐ EVER ☼
YJman is offline   Quote Quick Reply
Old 11-22-2010, 08:25 PM   #14
Jeeper
 
LaterJim's Avatar
 
Join Date: Aug 2010
Location: Springboro, OH
Posts: 80
Ya, got 1" hockey pucks...could be tranny i guess, but it accelerates just as it did before...just took a pic of the front u joint...there seems to be some oozing of something thick, maybe grease. You can kind of see where i wiped it off...def not the same on the rear one...any ideas?

LaterJim is offline   Quote Quick Reply
Old 11-22-2010, 08:49 PM   #15
Jeeper
 
YJman's Avatar
 
Join Date: Sep 2010
Location: Connecticut
Posts: 988
While your under there trying to figure it out, regrease all your fittings. Not saying this will fix it but it's always good to keep after those grease fittings to keep the Jeep running smoothly as possible

If it still accelerates fine and everything, I doubt it's a tranny problem then. As said before, check the motor mounts and tranny mounts. I'm stumped
__________________
Use Locktite, Or Kiss Your Nuts Goodbye!
Small like a CJ, better than a TJ!
☼ YJ â○⌐ EVER ☼
YJman is offline   Quote Quick Reply
Old 11-22-2010, 08:53 PM   #16
Jeeper
 
LaterJim's Avatar
 
Join Date: Aug 2010
Location: Springboro, OH
Posts: 80
Will do on the mounts, thanks much...went wheelin the other weekend and it started on the way back...grrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
LaterJim is offline   Quote Quick Reply
Old 11-22-2010, 09:13 PM   #17
Jeeper
 
Join Date: Jun 2010
Location: Columbus, OH
Posts: 80
Do you by chance have an exhaust leak starting to develop?
__________________
'91 stock YJ, red, 4cyl, 5 spd. I wonder how long that configuration can last???
Rover is offline   Quote Quick Reply
Old 11-22-2010, 09:20 PM   #18
Jeeper
 
LaterJim's Avatar
 
Join Date: Aug 2010
Location: Springboro, OH
Posts: 80
I did have a crack where the 2 pipes go into one (don't know the technical terms) as i could feel air coming out, but we welded that the best we could.
LaterJim is offline   Quote Quick Reply
Old 11-22-2010, 10:46 PM   #19
Jeeper
 
JEEPSTER988's Avatar
 
Join Date: Oct 2010
Location: Las Vegas, NV
Posts: 71
Images: 3
Did you check the leaf spring bolts and bushings. A 94 is leafs right
__________________
JEEPSTER 988
SMASHIN JEEPS FOR LIFE !!!!!!!!!!!
JEEPSTER988 is offline   Quote Quick Reply
Old 11-23-2010, 07:30 AM   #20
Jeeper
 
LaterJim's Avatar
 
Join Date: Aug 2010
Location: Springboro, OH
Posts: 80
ya, everything i can touch looks solid...i have no idea where to try and fix first
LaterJim is offline   Quote Quick Reply
Old 11-23-2010, 11:36 AM   #21
Jeeper
 
JEEPSTER988's Avatar
 
Join Date: Oct 2010
Location: Las Vegas, NV
Posts: 71
Images: 3
I would take a torque wrench and make sure everything on the suspension specs out. Did the problem occur the same time you swapped the tires. Might have bent rim. It might balance out but be bent.
__________________
JEEPSTER 988
SMASHIN JEEPS FOR LIFE !!!!!!!!!!!
JEEPSTER988 is offline   Quote Quick Reply
Old 11-23-2010, 11:51 AM   #22
Jeeper

WF Supporting Member
 
jeepjones's Avatar
 
Join Date: Jul 2010
Location: Canada, Eh?
Posts: 1,892
Did you jack up the rear end and check the rear drive shaft u joints with the jeep in neutral?
__________________
jeepjones is offline   Quote Quick Reply
Old 11-23-2010, 12:12 PM   #23
Jeeper
 
LaterJim's Avatar
 
Join Date: Aug 2010
Location: Springboro, OH
Posts: 80
Quote:
Originally Posted by JEEPSTER988 View Post
I would take a torque wrench and make sure everything on the suspension specs out. Did the problem occur the same time you swapped the tires. Might have bent rim. It might balance out but be bent.
I want to say yes...i had a puncture on the front right, and swapped a new tire onto the rim. Do you know off hand what the torque specs are on the lug nuts? I doubt the rim is bent just becasue there was really no weight on the rim itself when the tire was going down. The other 3 tires have weights on them where someone tried to balance them, and the new one i put on does not...so i may start there...thanks for the input
LaterJim is offline   Quote Quick Reply
Old 11-23-2010, 12:12 PM   #24
Jeeper
 
LaterJim's Avatar
 
Join Date: Aug 2010
Location: Springboro, OH
Posts: 80
Quote:
Originally Posted by jeepjones View Post
Did you jack up the rear end and check the rear drive shaft u joints with the jeep in neutral?
i visually inspected the joints, and all seem to be in good shape. i will jack it ulp and see if there is any play. thanks
LaterJim is offline   Quote Quick Reply
Old 11-23-2010, 12:26 PM   #25
Jeeper
 
bobjenkins's Avatar
 
Join Date: May 2010
Posts: 3,646
Ok I've got a question. At around 50 my Jeeps steering wheel wobbles. Is this driveline wobble or would I feel that in the pedals instead. I also do not have a sye, 3in lift and a t case drop
bobjenkins is offline   Quote Quick Reply
Old 11-23-2010, 01:34 PM   #26
Drives by Braille

WF Supporting Member
 
AzTJ's Avatar
 
Join Date: Dec 2006
Location: For-8-Oh!
Posts: 13,621
Quote:
Originally Posted by bobjenkins View Post
Ok I've got a question. At around 50 my Jeeps steering wheel wobbles. Is this driveline wobble or would I feel that in the pedals instead. I also do not have a sye, 3in lift and a t case drop
The steering wheel wobble is a suspension issue not driveline. If it were in fact driveline, you'd feel your seat vibrating.

I'd maybe get a the front end aligned and the wheels balanced.
AzTJ is offline   Quote Quick Reply
Old 11-23-2010, 07:32 PM   #27
Jeeper
 
JEEPSTER988's Avatar
 
Join Date: Oct 2010
Location: Las Vegas, NV
Posts: 71
Images: 3
On the steering wheel wobble, driveline wobble or vibration is felt behind and under the driver. It usually has a pattern of a sort of roll through the vehicle. If your wheel wobbles, you may be on the way to death wobble. Super fun. The drag link and track bar should be as close to the same angle as each other. If they aren't, this is where the drop pitman comes into play. Also, inspect the steering dampener. If it is old or beat, could need new one. Also, take a pry bar and see if the Sargent link ends pop at all. Either way, your problem is probably in the front tires or suspension.
__________________
JEEPSTER 988
SMASHIN JEEPS FOR LIFE !!!!!!!!!!!
JEEPSTER988 is offline   Quote Quick Reply
Old 11-23-2010, 07:35 PM   #28
Jeeper
 
JEEPSTER988's Avatar
 
Join Date: Oct 2010
Location: Las Vegas, NV
Posts: 71
Images: 3
On the tires, a bent rim can come factory. If it looks as if it has no weights, get the new tire balanced. If one front tire is new and one old, and your allignment is out some, they can fight each other and create bump steer. Possibilities...
__________________
JEEPSTER 988
SMASHIN JEEPS FOR LIFE !!!!!!!!!!!
JEEPSTER988 is offline   Quote Quick Reply
Old 11-23-2010, 07:50 PM   #29
Jeeper
 
LaterJim's Avatar
 
Join Date: Aug 2010
Location: Springboro, OH
Posts: 80
Just balanced the tires...the vibe is still there...if I get up to about 55 and throw it in neutral there is no vibe, also I can be in any gear below that speed and no vibe, so I am thinking dariveshaft related...my rear differential is slightly angled up which I think is off because I don't have a SYE, Just a tcase drop
LaterJim is offline   Quote Quick Reply
Old 11-23-2010, 09:33 PM   #30
Deaky

WF Supporting Member
 
Fweaky's Avatar
 
Join Date: Aug 2009
Location: Central Virginia
Posts: 2,202
Images: 18
I had the same symptoms on my YJ with a 4" lift until I installed a SYE and CV drive shaft.

__________________
Nothing is foolproof to a sufficiently talented fool.
Fweaky is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Guessing Game: Classic modified Jeep Geoff@Bestop General Jeep Discussion 17 10-10-2010 11:21 PM
Everyone likes guessing pics..... Another interesting item.... dave@rokmen TJ General Discussion Forum 71 05-20-2010 07:49 PM
Everyone likes guessing pics..... Something very cool.... dave@rokmen TJ General Discussion Forum 61 01-04-2010 05:14 PM
How Obama Got Elected Scout Off-Topic 122 11-20-2008 02:38 PM
I'm guessing fuel pump yjswampthing YJ General Discussion Forum 1 08-29-2006 08:13 AM


logo carid shop wrangler parts carid fender flares custom wheels store avs deflectors at carid
» Rates
Get low rates on auto insurance in Canada!

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 01:54 AM.



Jeep«, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC