CJ7 slack in the rear diff - JeepForum.com
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep CJ Forum > CJ7 slack in the rear diff

All Bilstein shocks & struts - Lowest Prices Ever and TERAFLEX JK Speed bump kit AND limiting strap kit!! AT ROCRuffstuff Axle Simple Swap Kit!

Unread 03-30-2010, 01:05 AM   #1
Registered User
1985 CJ7 
Join Date: Mar 2010
Location: Southern IN
Posts: 5
CJ7 slack in the rear diff

I'd like some advice on diagnosing slack in the rear differential of my 1985 CJ7 with the stock AMC 20 and 2.73 gearing. When moving through the gears, the driveline very noticeably clunks as the torque on it changes. When parked, I can grasp the rear driveshaft and turn it; there is about an inch of play. I was wondering if anybody could guess what was worn out (ring/pinion, differential, axles...). There is a locker in the rear and one-piece axles, but I don't know any details on these mods as they were done by previous owners.

rex_altitudo is offline   Reply With Quote Quick reply to this message
Unread 03-30-2010, 03:38 AM   #2
Real Jeeps have dents.
CJ7-Tim's Avatar
2000 XJ Cherokee 
Join Date: Apr 2002
Location: out in the garage - Minneapolis, Minnesota
Posts: 22,592
The ring and pinion may be worn a bit, but you are describing the normal behavior of a locker. Practice your shifting or remove the locker. Double check that the u-joints are not worn out.

Total US debt has increased by 70% under Obama, from $10.625 trillion on January 21, 2009 to $18.005 trillion January 1, 2015.

Progressive Liberalism: Bringing you new Healthcare ideas so wonderful, they have to include mandatory participation ......

Originally Posted by Ronald W. Reagan: Government is not the solution to our problems; Government is the problem.
CJ7-Tim is offline   Reply With Quote Quick reply to this message

amc 20 , differential , rear differential , rear end , rearend

Quick Reply

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:


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

Suggested Threads

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.