Modified XJ Cherokee Tech XJ (84-01)
All modified tech questions. If it modifies your XJ beyond stock parts ask it here.

SYE Questions after 4.5 RC Lift

Old 08-28-2015, 01:05 AM
  #1  
Junior Member
Thread Starter
 
Rich3's Avatar
 
Join Date: Sep 2014
Posts: 33
Likes: 0
Received 0 Likes on 0 Posts
Model: Cherokee
Default SYE Questions after 4.5 RC Lift

I recently installed a Rough Country 4.5 X-Series kit. It came with 3 degree shims already installed on the spring packs. It also came with a transfer case lowering kit.

After installing it and driving it for a couple weeks, I noticed a vibration around 45. It seems most noticeable if I am coasting down hill, and just barely press the gas. It's like the coast side of the ring and pinion make the vibration go away, and pressing the gas "floats" the pinion in between the drive and coast sides of the gears.

It also vibrates pretty good under heavy acceleration, between 25-50.

I'm planning on taking this on a 900 mile round trip. Anything I am at risk of damaging?

I know I need an SYE, that's coming soon. Before I go, I'm changing to oil, t-case fluid, front and rear diffs, and new rear u-joint.
Rich3 is offline  
Old 08-28-2015, 01:42 AM
  #2  
Senior Member
 
Tsaani97xj's Avatar
 
Join Date: May 2013
Location: Maryland
Posts: 600
Likes: 0
Received 0 Likes on 0 Posts
Year: 1997
Model: Cherokee
Engine: 4.0
Default SYE Questions after 4.5 RC Lift

While the problem needs to be addressed I wouldn't worry about any major failures unless you already have parts in bad shape. I have over 50k with no SYE and 5" of lift. Saying that with shackle relocators, extended shackles and 4* shims my angles dont give the coast vibes you describe. Ive had them before I got it setup the way it is now and drove thousands of miles with them. Not ideal and yes you are stressing your ujoints but IMO if you cant fix before the trip and can tolerate the annoyance it will survive.
Tsaani97xj is online now  
Old 08-28-2015, 01:46 AM
  #3  
Junior Member
Thread Starter
 
Rich3's Avatar
 
Join Date: Sep 2014
Posts: 33
Likes: 0
Received 0 Likes on 0 Posts
Model: Cherokee
Default

I have zero vibrations at highway speeds, which is 99% of this trip. Hoping all goes well.
Rich3 is offline  
Old 08-28-2015, 08:28 AM
  #4  
kgm
CF Veteran
 
kgm's Avatar
 
Join Date: Oct 2013
Location: Denver
Posts: 1,589
Likes: 0
Received 0 Likes on 0 Posts
Year: 99
Model: Cherokee
Engine: 4.0
Default

I'd bring a spare u joint.
kgm is offline  
Old 08-28-2015, 08:41 AM
  #5  
CF Veteran
 
Fred/N0AZZ's Avatar
 
Join Date: Jul 2013
Location: Monett, MO.
Posts: 7,554
Likes: 0
Received 0 Likes on 0 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
Default

The sooner the SYE goes in the better so you can remove the TC drop kit and get rid of that stress. 3" of lift is pretty much max for a TC drop kit over that requires an SYE because of the problems in the driveline it cause's. The drop kit also is very hard on your engine and trans mounts.


Install the SYE/driveshaft then see if you still have any issues that need to be dealt with then. I have shims in my XJ with an SYE can't remember what degree they are.
Fred/N0AZZ is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Nildnas
Off-Topic Discussion
89
12-16-2015 11:43 AM
southfloridajeeps
Modified XJ Cherokee Tech
18
11-25-2015 11:02 PM
Doogluus88
Cherokee Chat
6
09-06-2015 03:17 AM
RickJames Bish
Modified XJ Cherokee Tech
5
09-02-2015 03:22 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Quick Reply: SYE Questions after 4.5 RC Lift


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: