Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum > Drive line question

Join Wrangler Forum Today

Thread: Drive line question Reply to Thread
Post Icons
You may choose an icon for your message from the following list:

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
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.

Additional Options
Miscellaneous Options

Topic Review (Newest First)
04-27-2009 11:52 AM
Coyote_94YJ Well that depends on what the previous owner has done to the jeep. On a normal factory functioning yj that shouldn't happen. When you turn either tire the opposite tire shouldn't turn. You "might" get the driveshaft to turn my spinning the driver side tire. HOWEVER!! If the previous owner has modified the front axle (as I have) that all sounds normal.

The reason behind all of this is in a factory setup there is a vacuum actuated motor that engages and disengages the front axle. The axle shaft going from the center differential to the passenger side is a 2 piece shaft with a shift collar that slides between the 2 to engage the front end. It is prone to failure because it requires engine vacuum to operate and that comes from some cheap hard plastic lines that get brittle with age and break. Because your 4WD is dependent on those lines, some of us have replaced those vacuum lines with a product called Posilock which replaces those vacuum lines by a hand operated cable that you mount on or under your dash. Others have rigged up the front axle to turn all the time like the newer TJ's are set up. You can replace the YJ 2 piece shaft with a TJ single piece shaft or do like I did and take the vacuum motor apart and install a heavy duty spring to keep it in the engaged position all the time. Which ever way it is/was done those vacuum lines are no longer required.

Hope this helps, and welcome to the forum or nut house as some of us call it.
04-27-2009 10:12 AM
James 9479
Drive line question

Hi guys and gals. new at this site and a first time jeep question. I have a 1990 jeep wrangler,when I had it on jack stands and 2 hi I noticed when I spun the P.side tire, the front drive shaft turns?but when I spun the D.side tire the front drive shaft did not turn,but the P.side tire was turning the oppisite way? is this normal. in 2hi? Thanks James.

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

All times are GMT -5. The time now is 07:26 AM.

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