4wd light blinks

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02chevyhoe

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So I decided to put my tahoe in fwd and drive it up a steep alley to try it out since this will be my first winter with the new 3/5.5 drop Everything worked fine but the front diff. Sounded weird to me kinda like a slite grind so I put her in the shop and hey told me I needed a driver side axel and both front axel seals also upper ball joint which I told them to hold off on. I'm guessing the grind was from lack of fluid cuz of the seals. Anyways I got my car back with new seals and front axel and 2 weeks later decided to try out. 4wd again but it won't shift into 4wd or 4 auto now. Light just blinks. Anythoughts?
 

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