spinning in snow - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 03-21-2014, 09:04 PM   #1
Newb
 
Join Date: Mar 2014
Posts: 1
spinning in snow

Hey everyone I have a 92 yj with a 2.5" pro comp lift and just last week my vacuum for the 4x4 went out so I bought a posi lock for the front stock axel, now when I first used the posi lock I put the trans case in 4h and locked the front axel with the posi as I started to drive down the street in abt 2" of snow the rear end was sliding and felt like it was digging only on the right side, left like I was gonna spin out, I'm running 31 AT tire, my first yj and kinda a newbie so any suggestions or comments b appreciate

Hercules_Yj is offline   Quote Quick Reply
Old 03-22-2014, 08:47 AM   #2
Jeeper
 
Join Date: Jul 2013
Posts: 114
Images: 3
Posi locks work really well. First thing to look at is to make sure your cable is adjusted correctly. Some times if it was not adjusted the shift fork might not slide over and engage the collar locking both shafts together. Second, you probably have an open differential in your front end. Even though you shift your TC in to 4wd, the front end will receive power however if one tire looses traction it will spin sometimes called "two wheel peel". The best way to fix this is to install a locker or limited slip so you will have true 4wd. Take your time learning to drive your jeep in snow. Learn to use your breaks to help some what with traction.

YelloJ74 is offline   Quote Quick Reply
Old 03-22-2014, 10:01 AM   #3
Jeeper
 
Join Date: Aug 2011
Location: north of St.Franisville La.
Posts: 2,071
Send a message via Yahoo to Nubby55
Most are open in the rear also! That mean only one in the front, and one in the rear pull at the same time when in 4X4. Realy just a 2 wheel drive system when in 4X4, and just 1 wheel in the rear when in 2hi. Sucks!
__________________
The Government can not give anything to anybody that it does not first take from someone else !
Nubby55 is offline   Quote Quick Reply
Old 03-22-2014, 01:26 PM   #4
Jeeper
 
Join Date: Jan 2013
Location: CA
Posts: 657
An open differential drives both wheels - BUT - there is a caveat that many people don't know about.

Read this post by Jerry Bransford:
Why do I need a locker? I thought I had 4WD!

In short, open differentials develop torque dependent on traction - both tires must have traction (be able to grab the ground) for torque to develop. This torque is always split 50/50 between both sides of the axle with an open differential. Development of torque depends on resistance to the tires spinning. Now comes the caveat - the amount of torque developed (which is split 50/50 between the two tires) depends solely on the amount resistance put on the fastest spinning tire. If one tire on an axle spins fast with little or no resistance (poor traction), it's axle partner (the tire that isn't spinning and has good traction) will get little to no torque. No torquey = no movey.

The mechanics of the open differential are great for the street, but proves to be a limitation, and the Achilles Heel, of 4WD vehicles. It's why enthusiasts opt for lockers of some sort.

And just to clarify - Posi-lok does not lock the differential. It decouples the passenger side axle from the differential manually, instead of using the vacuum operated CAD system.

If you are interested in the mechanics of an open differential you might want to watch this video:

__________________
1990 Wrangler 4.2L
Howell TBI, 2.5" OME springs; OME Nitroshocks; 5/8" OME shackles; Swaybar discos; 31" tires/15" rims
NonRubicon is offline   Quote Quick Reply
Old 03-22-2014, 02:16 PM   #5
Jeeper
 
reno92's Avatar
 
Join Date: May 2013
Location: Cardiff By The Sea / Glamis
Posts: 985
With an open diff front and rear you still should have one tire front and rear turning, normally the opposite side like left front and right rear. If you only felt the rear slipping I would suggest your front end is not locking in. I prefer open diffs in snow over a locker. One thing to check, are you running the same size tires front and rear? They need to be the same size diameter for the 4wd to work well. Have someone outside the jeep see if you have at least one tire front and back turning, if not your front end is not locked. Normally it takes a bit before the front end engages with the vacuum, but with the posi locker it should happen right away. I would bet your posi locker is not engaging.
reno92 is offline   Quote Quick Reply
Old 03-23-2014, 08:56 PM   #6
Jeeper
 
Join Date: Aug 2011
Location: north of St.Franisville La.
Posts: 2,071
Send a message via Yahoo to Nubby55
Yes, NonRubicon is 100% Right and What I said is Technically Wrong!

NonRubicon
But Basicly, The Normal Dumb Ass, Like Me, and most On Here Driving A Jeep With OPEN Dif., Only ONE IS Going To Spin On Each End!
__________________
The Government can not give anything to anybody that it does not first take from someone else !
Nubby55 is offline   Quote Quick Reply
Old 03-23-2014, 09:01 PM   #7
Jeeper
 
Join Date: Aug 2011
Location: north of St.Franisville La.
Posts: 2,071
Send a message via Yahoo to Nubby55
I think you did not fully engage the system. When you pull on the handle lightly, hold it untill you fill the CAD slide over. [drop in] Try this, I hope it helps you!

__________________
The Government can not give anything to anybody that it does not first take from someone else !
Nubby55 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




» Featured Product

All times are GMT -5. The time now is 01:51 AM.



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