MY12 was 3.6 Pentastar. 3.8 was only upto Model Year 11. Yours may have been registered in '12, which is different.
When you are pulling on it, just be careful that you don't accidentally punch yourself silly when it lets go.
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'12 JK Rubicon V6 3.6L
'15 KL Trailhawk V6 3.2L
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