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The Original 3/8" Ruffstuff Diff Cover!Ruffstuff Axle Simple Swap Kit!The Ruffstuff NOT Universal 4 Link Kit!

Unread 08-29-2013, 04:12 AM   #1
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2007 JK Wrangler 
Join Date: Aug 2013
Location: Colbert, WA
Posts: 1
4WD engage or not

I just finished having a True Trac posi put in my Dana 30 front axle as well as a Trac-lok posi in the Dana 44 rear axle. What I read all over the internet tells me that they both act automatically in engaging when needed, and otherwise operate as "open" when not needed. I presume I still need to use the 4WD (HI or LOW) selector to put my Jeep into that mode and then the posis can act when needed??? When I am not in 4WD mode, will the rear posi still engage if it begins to slip, say, in the rain??? Thanks very much.

Texinwa is offline   Reply With Quote Quick reply to this message
Unread 08-29-2013, 12:53 PM   #2
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Location: Livonia, Michigan
Posts: 23
I am not trying to be a smart *** BUT these questions should have been asked before you had these parts installed. Basically you have the jist of how they work. Except a posi unit works off clutches in the differential. They are "always" working. There is no "on and off" with a posi. The clutches allow the wheels to turn at different speeds during turns without the squeeling and banging of a true locker. Hope that helps.
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Unread 08-29-2013, 01:15 PM   #3
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2013 JK Wrangler 
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Posts: 419
YES - you still need to put your Jeep into 4wd to provide power to the front axle.
djm is offline   Reply With Quote Quick reply to this message
Unread 08-29-2013, 01:47 PM   #4
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2012 JK Wrangler 
Join Date: Jan 2007
Location: West Haven, UT
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Both the above are correct. Your rear posi will always act as a LSD. In 2wd your front is just an open, unpowered axle - there's nothing to slip because there's no power. When you're in 4wd, now there's power and it will also act as a LSD.
Utah Jeep Crew #148
No powerball here? How am I supposed to finance the mods?!?
'12 Sport...miss my YJ for all the wrong reasons though
Godholio is offline   Reply With Quote Quick reply to this message

4wd , posi , Trac-lok , true trac

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