Define won't go into gear. Do you mean it won't move when you put it in gear? Will it roll in neutral. If you heard a noise and saw smoke coming from your rear area of the jeep you may have burnt up a bearing in the axle. If it will roll and the motor free spin when giving it gas in neutral or park then you have a trans or t-case issue.. Maybe you accidentally knocked the t-case when stopping to look at the smoke? More of a description would help a lot.
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