Pinion angle problems - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 08-08-2011, 05:36 PM   #1
Jeeper
 
Join Date: Jan 2011
Location: Cincinnati
Posts: 474
Pinion angle problems

Hey there jeep forumers. I'm having a small issue that is becoming more and more of a problem. I installed one of UCF's ultra-high clearance skids about 4 months ago. I currently have 1.25" bl, 4" suspension lift, Ford 8.8 rear end, SYE w/ CV driveshaft, adjustable upper and lower rear control arms, a 1" mml and have lowered the skid plate 1" with spacers.

When I first put on the skid plate w/ the 1" spacers and mml, the pinion angle was okay. It was not vibrating and I could not hear the d-shaft clicking. After I did some offroading, it starts making a clicking noise, I figured the springs had maybe settled some so I adjusted the angle to be higher. Went off roading again, it starts up again. After working on it last week, it stopped the driveshaft clicking but started with some vibes from 0-15 mph. Again, I go off road for a few hours and come out and now the vibes were from 0-35 mph. Which leads to yesterday when the driveshaft breaks. What's the deal? I can not adjust the pinion angle up any higher because the brackets on the rear end are almost touching the gas tank skid plate and the spring perches are up against the shocks. What is making the pinion angle more severe each time I get into some mud and rocks? How can I correct this without breaking more stuff? lol Any advice is always appreciated.

99TJCrawler is offline   Quote Quick Reply
Old 08-08-2011, 09:11 PM   #2
Jeeper
 
Join Date: Jan 2011
Location: Cincinnati
Posts: 474
Anyone have any advice for me?

99TJCrawler is offline   Quote Quick Reply
Old 08-08-2011, 09:33 PM   #3
Jeeper
 
Wench's Avatar
 
Join Date: May 2010
Location: Lincolnton, NC
Posts: 475
Send a message via AIM to Wench
might want a longer driveshaft..not sure but you could be pushin the limits of the short-arm...the only thing i can think of is to extend your wheelbase with a long-arm upgrade...could be wrong..
__________________
You can lock it..even put a different t/c in it..but its still not a RUBICON!
Wench is offline   Quote Quick Reply
Old 08-08-2011, 09:50 PM   #4
Jeeper
 
Join Date: Jan 2011
Location: Cincinnati
Posts: 474
The only problem with that is the gas tank. I would need to get a fuel cell or something and put it in the back of the jeep. I have contemplated that for a while now. That would be an expensive venture. If I move the axle back, I'll also have to move the shock upper mounts back I think...
99TJCrawler is offline   Quote Quick Reply
Old 08-08-2011, 09:59 PM   #5
Jeeper
 
Irongrave's Avatar
 
Join Date: Apr 2011
Location: Erie, PA
Posts: 2,800
Send a message via AIM to Irongrave
where did the shaft break. sounds like you had a shaft problem and not the pinon angle. you said it was a CV style shaft but was the slip part of the shaft moving? also lose the spacers on the belly skid pointless to run a tummy tuck skid then drop it.

photos will help
__________________
4421
Irongrave is offline   Quote Quick Reply
Old 08-08-2011, 10:07 PM   #6
Jeeper
 
Join Date: Jan 2011
Location: Cincinnati
Posts: 474
The spacers are on the tummy tuck because without them, the pinion angle is too severe and the driveshaft is too angled. I know it's ridiculous, it bugs the hell out of me lol. The part that broke was where the slip yoke piece connects to the flange that connects to the rear end. It is certainly possible that the u-joint failed. That is where the driveshaft itself broke. I was able to just purchase the slip yoke piece from a driveline store. I will get some pictures up on here tomorrow first thing.
99TJCrawler is offline   Quote Quick Reply
Old 08-08-2011, 10:09 PM   #7
Jeeper
 
Join Date: Jan 2011
Location: Cincinnati
Posts: 474
And I'm pretty sure that the cv part was moving. When I examined it, it seemed to move freely in and out on the splines
99TJCrawler is offline   Quote Quick Reply
Old 08-09-2011, 01:27 AM   #8
Jeeper
 
scot68's Avatar
 
Join Date: Apr 2011
Location: Mesa, AZ
Posts: 455
I also do not understand the need for t-case drop spacers with a CV style d-shaft on only 4" of suspension lift. Do your angles look similar to this? I pulled this diagram from Tom Wood's site. A lot of good info on there. You may have to consider relocating your spring perches and shock brackets to gain the proper geometry.
Attached Thumbnails
Click image for larger version

Name:	cv_angle.jpg
Views:	39
Size:	29.1 KB
ID:	61889  
scot68 is offline   Quote Quick Reply
Old 08-09-2011, 08:57 AM   #9
Jeeper
 
jwm1986's Avatar
 
Join Date: Dec 2008
Location: Evansville, IN
Posts: 1,024
As long as the slip part of your shaft has enough room you can bring in your lowers to make more room as well. That also slightly changes the angle of the shaft so make sure to check before you take off if you do that. I've got a tummy tuck on top of a 3" suspension so mine is probably even worse than yours and I have no issues.
__________________
2000 Jeep Wrangler Sport
4.0L / 5spd
jwm1986 is offline   Quote Quick Reply
Old 10-11-2011, 08:34 PM   #10
Jeeper
 
Join Date: Nov 2008
Posts: 878
Ive recently been considering an 8.8 swap myself.
someone else here done it and is having issues with vibes also,its been stated that its something to do with the pinion shaft being too far over too one side and the shaft isnt right down the center,so the shaft binds up.

Im still researching it,so check the angles....from diffrent angles
__________________
Pincho De Lapiz
ou812 is offline   Quote Quick Reply
Old 10-12-2011, 12:27 AM   #11
Jeeper
 
Minn_wild1's Avatar
 
Join Date: Aug 2010
Location: Iron Range, MN
Posts: 194
Images: 3
What was the original pinion angle set at on the 8.8? Did you order it from ECGS?
You pinion angle should be around 17 degrees for the lift and TT with a SYE and DC DS.
__________________
33" BFG A/T's, 2.5" RC w/ 1.25" BL, MORE MML, Custom Bumpers, Home made disconnects, 8.8 LSD and D44 Rubicon Locker 4.10 gears.
Minn_wild1 is offline   Quote Quick Reply
Old 10-12-2011, 01:44 AM   #12
Jeeper
 
solman's Avatar
 
Join Date: Apr 2010
Location: Southern PA
Posts: 1,667
I am running the same setup as you. 4" lift UCF ultra high clearance skid (not dropped), SYE/CV and an 8.8. I have the 8.8set at 18 degrees with no vibes what so ever.
If you upper control arms arm out of adjustment or you are hitting the gas tank try putting on some adjustable lowers and shorten them. You will be able to increase the angle and get the rear away from the gas tank.

__________________
Favorite quote, Thanks GoldenSahara00 "not many people do it. most of the guys who do do it, don't sit on the computer and talk/write about it, they do it then go wheel"
solman 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
My Clutch Problems and How I Resolved Them linz TJ Tech Forum 6 05-10-2013 07:11 PM
Pinion angle question with picture JeepJunkie68 TJ General Discussion Forum 12 03-26-2011 11:09 AM
axle build from east coast gear supply AdrenalineJunky45 Builders Corner 29 03-23-2011 09:15 PM
Pinion Preload Question rketr General Jeep Discussion 9 06-15-2008 04:32 PM
pinion angle black tj 97 TJ Tech Forum 9 03-01-2007 09:15 PM


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 06:58 PM.



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