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Discussion Starter #1
hi, got a 06 5.9 with built 48re here! just installed a lockup switch and everything works fine! but the lockup switch didnt work in 4x4 low! its a manual shift transfer case(np271) what can cause this?

Tanks!!
 

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If it works in 4 high and 2wd then I would guess converter friction disk slipping in low because of gearing.
 
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