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Alloy USA Differential Permanent Lock Kit for Front Dana 30 (87-95 Jeep Wrangler YJ)

Market Price $68.99 You Save 13% ($9.00)
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  • Item J11886
  • MPN# 451100

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Ship to: Ashburn - 20149
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    Features & Details

    • Differential Permanent Lock Kit with Front 30
    • Works with 1987 - 1995 YJ Wranglers
    Specs. The Differential Perma-Lock Kit from Alloy USA is a permanent replacement. It's just what you need when your failure prone OE vacuum disconnect system is not working as well as it should.

    Construction. This kit permanently engages the central axle disconnect, also known as the CAD, and combines both axles in the front. When it's installed, the axles will automatically engage when the transfer case is put into 4-wheel drive.

    Application. This differential kit works with 1987 - 1995 Wrangler YJ models.

    Fitment: 1987 1988 1989 1990 1991 1992 1993 1994 1995 Details

    CA Residents: Warning: California's Proposition 65

    What's in the Box
    • (1) Cover
    • (1) Gasket
    • (1) Hardware
    Tech Specs
    Will it fit my Wrangler?

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    Questions & Answers (10)

    5 Top Rated Questions

    After installing can you still flat tow your Jeep

    • With the lock engaged, you would greatly reduce your YJs flat towing ability due to the way it will lock the front axles. You will want this disengaged so that the wheels can spin freely.

    Helpful (2)

    Does this kit have any effect on handling on-road in 2wd?

    • The Alloy USA Differential Permanent Lock Kit for Front Dana 30 will have minimal effect on road handling in 2wd. In 4WD this will get rid of the vacuum disconnect that is prone to failure.

    Helpful (1)

    I realize the wheels will turn the same rate when flat towed, but will this create backlash to transfer case? In other words, can I flat tow without destroying my drivetrain?

    • This kit will lock the front axles to the carrier, however if the transfer case is in 2wd or neutral, then this will not cause any additional wear on the transfer case.

    Helpful (0)

    Can I use the same shifting fork?

    • The factory shift ford is able to be used, though it will need to be inspected to ensure that it is still in a condition that is safe for reuse. Otherwise it will need replaced.

    Helpful (0)

    After this is installed both front axles work at the same time without none of them disconnecting and three tires are working at the same time? The two in front and one or the other in the rear.

    • This will make the front axles automatically engage when the Jeep is put into 4WD, it would not change the function of the rear axles. 

    Helpful (0)
    Post Your Question
    5 More Questions
    Does this come with the shift fork? 1 answer
    will this effect anything when flat towing? 1 answer
    Will it make me have wheel hop in 2wd? 1 answer
    Does it engage and disengage as needed or is it permanently in 4wd after installation? I am new at all of this jeep stuff. 1 answer
    I drive a 89 xj Cherokee with the cad style Dana 30. I assume it used the same axle as the wrangler so im Just wondering if this will work on that axle also? 1 answer

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    Customer Reviews (11) Write a Review

    Overall Rating 4.2

    out of 5 stars

    • Fit 4.181818 4.2
    • Bang For Your Buck 4.545455 4.5

    • 5/5

      October 07, 2018

      CAD delete

      Easy install and so far has worked great keeping the two piece shaft locked together.


      Year: 1993Submodel: Wrangler

      Helpful (0)

    • 3/5

      August 19, 2018

      1995 jeep Wrangler

      I want to install this product in my jeep but one of the other reviews said you can't flat tow anymore. I need to know if I can still tow my jeep after I install this part? As I'm only one person and can't drive both my truck and jeep.


      Year: 1995Submodel: Wrangler

      Helpful (1)

    • 4/5

      July 18, 2018

      95 wrangler

      It’s works easy install, but your 4x4 light will always be on,


      Year: 1995Submodel: Wrangler

      Helpful (2)

    • 2/5

      April 03, 2018

      Needs work

      The rod wouldn’t fit through the fork(had to drill it out) Once the fork was in the casting it wouldn’t move to place it in the right spot. Spent another half hour grinding on the fork to make it work. But it works so I guess it’s ok.


      Year: 1990Submodel: Wrangler

      Helpful (4)

    • 5/5

      January 16, 2018

      Easy and inexpensive.

      This is an easy and inexpensive fix to a known problem.


      Year: 1994Submodel: Wrangler

      Helpful (2)

    • 4/5

      January 15, 2018

      had it installed

      unfortunately the weather turned cold just as i got it, since i have to work outside i had a mechanic install it. he said it could have been easier but not too bad. took him a little over an hour with a lift and good tools. just picked it up and the 4x4 light is on but it doesn't drive like it is in 4x4. got home and on dirt and tried it out and seemed to work fine. guess that maybe something inside makes it think is is always in 4x4. but otherwise so far so good. just have to remember i can't flat tow anymore.


      Year: 1991Submodel: Wrangler

      Helpful (4)

    • 4/5

      November 24, 2017

      Decent quality, missing pieces

      When mine arrived it was missing the small bag of hardware, e clips, washers, connectors etc. took about 9 days of back and forth with customer service but they sent out the hardware- got it installed and works as advertised, had to look up installation instructions online, none provided. Took about an hour including me breaking a bolt.


      Year: 1995Submodel: Wrangler

      Helpful (2)

    • 5/5

      November 07, 2017

      Great Product

      Great product easy to install. Love to do business with Extreme Terrain


      Year: 1993Submodel: Wrangler

      Helpful (2)

    • 5/5

      June 22, 2017

      Alloy USA permant lock

      Easy to install and works great I used it immediately after installation


      Year: 1988Submodel: Wrangler

      Helpful (2)

    • 4/5

      August 03, 2016

      Solid product

      It looks it's gonna work but I haven't tried it so that's why it's 4 stars but looKS and feels solid


      Year: 1990Submodel: Wrangler

      Helpful (4)

    • 5/5

      May 22, 2016

      great product

      This is a great part to replace those stupid vacum lines very impressed this will be the second one I have bought


      Year: 1990Submodel: Wrangler

      Helpful (4)

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