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Topic Review (Newest First)
01-14-2011 07:17 AM
jakec i just took the shifter fork housing oof and put the sliding collar in the engaged position and put two thick tywraps on each side of it to hold it in place, its working great, cost abot 2 bucks, and took about 20 min.
01-14-2011 04:17 AM
Originally Posted by 90YJinPC View Post
Left the old fork in mine. Posi-lock install is not bad. Good instructions with list of drill bits and such item you will need. If you are not in a hurry, I found mine on Ebay for about a $100.00.

The perma lock is just what it sounds like. Full time 4wd.
The permanent lock listed above your post does not make full time 4wd (all wheel drive). It is only in 4wd if you engage the t-case. It basically just binds the inner and outer shaft like a one peice shaft is in there.
01-13-2011 10:11 PM
cnc On the YJs, there are two places 4wd gets engaged and disengaged. The first is the transfer case, and that is what is most directly activated when you move the shift lever. Secondarily, there is the axle disconnect in the front axle, which is what this thread is about. To get the best highway performance, you want them both disconnected. What this does for you is it lets the front drive shaft and half of the differential stay still while you're going 70 mph or whatever. The front drive shaft is the thing that connects the transfer case to the front differential. If you have the permlock, then when you shift into 2wd the transfer case is disengaged, but the front drive shaft still keeps spinning. This wears your front tires out really really fast. But at least, you're not going around with the massive tension in your drive train that you would have if you had 4wd engaged on the highway.
01-12-2011 04:22 PM
90YJinPC Left the old fork in mine. Posi-lock install is not bad. Good instructions with list of drill bits and such item you will need. If you are not in a hurry, I found mine on Ebay for about a $100.00.

The perma lock is just what it sounds like. Full time 4wd.
01-12-2011 01:57 PM
foreman1979 How hard was it to install the PSL-900? Did you replace the fork as well? I have minimal vehicle mechanical knowledge. I have a 1995 wrangler and the 4wd will not engage. Is this the cheapest easiest fix?

Also what about the perma lock?

Does that mean that it would always be in 4wd?
01-12-2011 03:36 AM
90YJinPC The PSL-900 is what I used on mine. No trouble so far. There is another kit with longer cable if you have lift. The homemade posi-locks look unreliable to me. Here is a site for an example.
4x4 Posi-Lok Replacements for vacuum and electric front axle engagement systems | Discount Jeep Parts
01-12-2011 12:52 AM
AzTJ The posi lock is just to engage the center-axle disconnect that is factory operated by vacuum. Instead of replacing the vacuum actuator with a posi lock, people swap in a TJ shaft, which is a 1-piece versus the 2-piece CAD shaft a YJ has.

Yes you'll still get 4WD when you pull up on the t-case lever.
01-12-2011 12:37 AM
4BangrYJ I too would like to read anyone's review of the Posi Lok system. I have been thinking bout getting one for my YJ
01-11-2011 05:39 PM
digsdirt Okay... I am sure this is a dumb question... but, how does replacing the axle shafts to TJ's get me into 4 wheel drive? Will the floor shifter still engage the 4 wheel drive? (that is the dumb question I am referring too)

I read through the Installing TJ D-30 shafts in a YJ on Stu Olsons website... but still not sure how the 4 wheel drive will be engaged after the axle shaft swap.
01-11-2011 04:25 PM
4Jeepn As stated just upgrade to the tj axle shafts. you will need to add a new inner seal OR you can just Pin the unit in the locked position if you want.
01-11-2011 04:20 PM
JeepAddOns-Chris The best is to upgrade to TJ style shafts and eliminate the disconnect all-together. Plus you get the added benefit of D-44 size u-joints.
01-11-2011 12:01 PM
Best Posi Lok?

I have an 88 YJ that I want to install a posi lok on. All the existing vacuum lines are shot. I have read a few threads on doing this and it seems like the majority of you like the Posi Lok set up.

One thread talked about an "automatic" type posi lok which cost roughly $100 more... which one is that? And how is it "automatic?" I got the impression it will save my life if I need to engage into 4wheel drive fast because I am about to drive off the side of a mountain.... Or, is it because it's just easier to engage the system.


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