GMC Jimmy Transfer Case Low

I Have A 4x4 Jimmy And Last Winter The 4x4 Started Acting Up And Staying In 4 Wheel Lo And Could Not Get It Out, Now When I Put It In 4...

When I Start My Swicth Lights Up Like It Should But I Cant Get It To Go Into 4hi But It Will Go Into 4lo

Yes I Have A 93 Gmc Jimmy 4 Wheel Drive And After I Went Muddin It Wouldn't Kick Out Of 4 Hi And Then I Got It To A Friends House And Got It...