YJ Dana 30 question - JeepForum.com
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post #1 of 3 Old 08-16-2017, 01:19 PM Thread Starter
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1992 YJ Wrangler 
Join Date: Nov 2016
Posts: 3
YJ Dana 30 question

Just wondering what the purpose of the shift motor to lock the passenger side inner and outer axle is REALLY for? My 92 YJ has an open diff......and as I understand it, if my right front is on the ground and my left front is off the ground, the left front will spin and the right will not and vice versa, even if the shift motor locks the right hand inner and outer axle, so why have it? I am assuming it is a money thing.........the struggle is real!


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post #2 of 3 Old 08-16-2017, 04:29 PM
Happy Joe
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2006 TJ Wrangler 
Join Date: Jun 2007
Location: Colorado, USA
Posts: 2,398
I believe it was originally an attempt to improve mileage by disconnecting the differential on one side (I found very little milage difference when I had one on a n '87 YJ and manually bypassed the vacuum switch at the transfer case to activate it full time... the constantly breaking hard vacuum lines that ran it were more problem than they were worth, IMO.
Eventually Jeep and other manufacturers figured out that it was cheaper for them just to let the open differential spin, so they removed the axle disconnects (be glad if yours is vacuum actuated some blazers had an electric disconnect that was even less reliable).


'06 TJ Rubicon; seemed like a good idea at the time; had many CJs...
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post #3 of 3 Old 08-16-2017, 06:28 PM Thread Starter
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1992 YJ Wrangler 
Join Date: Nov 2016
Posts: 3
I am going to delete the disconnect and put in the longer axle, i'm replacing the hubs/bearings and u joints and i have found out that the short outer axle is on back order for a month. So, axle upgrade it is!

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