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First off if this is in the wrong place I want to say sorry ahead of time. But i have a 1998 Tahoe that has vortec 350 and 4l60e trans I just recently swapped in a gm kingpin Dana 60 and a 14 bolt rear. I also installed a np241c from a 90 suburban. My problem is I had the push button np243 transfer case. Well with that being said when I put my new case in 2hi or 4hi the trans shifts great but if I put it in 4lo the trans want shift at all. Is there a way to wire something to tell the trans to shift in 4lo? If this has been discussed before please post if not any help will be greatly appreciated.
 

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* Speedo works correctly in 2h/4h?

* All the electronic shift stuff still in the truck or did you pull it?

May need to wire something up and when you go to 4Lo hit the 4Lo button to tell the ECU you're in low.

I'd start at the wiring diagram and look at anything related to the ECU/Transfer case interactions.

(If all the push button stuff is still there, did you try hitting the button when in 4Lo?)
 
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