Notices
Modified JK Tech Tech related bulletin board forum regarding subjects such as suspension, tires & wheels, steering, bumpers, skid plates, drive train, cages, on-board air and other useful modifications that will help improve the performance and protection of your Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) on the trail.

PLEASE DO NOT START SHOW & TELL TYPE THREADS IN THIS FORUM

Noob pinion angle question with pic

Thread Tools
 
Old Mar 28, 2017 | 10:03 AM
  #1  
raymo's Avatar
Thread Starter
JK Newbie
 
Joined: Apr 2016
Posts: 2
Likes: 0
From: Green Cove Springs, Florida
Default Noob pinion angle question with pic

My wife has a 2015 Jeep 4dr and we've put a 4 in lift and 35s on it. The kit is the Rough Country 4in x series and it has upper and lower adjustable control arms at each corner. The control arm lengths were set to spec but it looks to me like the rear pinion is pointing too high. I've read a little about axle wrap on acceleration that might move the pinion down but I'm clueless. Do I need to adjust this?
Reply
Old Mar 28, 2017 | 10:15 AM
  #2  
Da20captain's Avatar
JK Enthusiast
 
Joined: Aug 2012
Posts: 266
Likes: 10
From: Myrtle Beach, SC
Default

I agree it looks too high.
Reply
Old Mar 28, 2017 | 10:29 AM
  #3  
ronjenx's Avatar
JK Jedi Master
15 Year Member
 
Joined: Feb 2008
Posts: 12,907
Likes: 185
From: Maine
Default

No need to accept that angle when you have adjustable control arms. What's it look like sitting on the tires?
Since you mentioned axle wrap... That would tend to raise the pinion, and be more of a factor on leaf springs.

Last edited by ronjenx; Mar 28, 2017 at 10:31 AM.
Reply
Old Mar 28, 2017 | 10:38 AM
  #4  
jchappies's Avatar
JK Freak
Veteran: Air Force
 
Joined: Jul 2013
Posts: 644
Likes: 5
From: Santee
Default

Driveline and pinion angle offset should be within 3degrees of each other. With adjustable you should be able to get to 0-1degree easy
Reply
Old Mar 28, 2017 | 10:49 AM
  #5  
resharp001's Avatar
JK Jedi
FJOTM Winner
10 Year Member
Loved
Community Favorite
 
Joined: Jun 2013
Posts: 11,363
Likes: 2,089
From: Willow Park, TX
Default

That picture is a little misleading as it's jacked up. As Ronjenx asked, what does it look like when it's sitting under load? That rear DS and pinion should be fairly close to a straight line in the rear.
Reply
Old Mar 28, 2017 | 05:11 PM
  #6  
raymo's Avatar
Thread Starter
JK Newbie
 
Joined: Apr 2016
Posts: 2
Likes: 0
From: Green Cove Springs, Florida
Default

Thanks everyone for the input. The Jeep is jacked up in the picture but it is supported by jackstands under the axle tubes so it represents pretty much how it sits on the ground. I'm going to pick up an angle finder and see if I can't dial it in better
Reply
Old Mar 28, 2017 | 05:55 PM
  #7  
Biginboca's Avatar
JK Super Freak
 
Joined: Jan 2011
Posts: 1,127
Likes: 3
From: Delray Beach, FL
Default

Since you have a factory Driveshaft that pinion is too high and you might even have vibrations at high speed. For a factory shaft the pinion angles are forgiving but should still be somewhere between pointing level with the ground and pointing straight at the transfer case, yours is pointing above the transfer case. Aftermarket double cardan shafts need to point directly at the transfer case...


Last edited by Biginboca; Mar 28, 2017 at 06:00 PM.
Reply




All times are GMT -8. The time now is 08:33 AM.