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Discussion Starter · #1 ·
Hello Everyone,
I have a 07 Duramax CCLB 208k Bone stock. Started seeing “range shift inhibited” a few times, shifted from D to P, back to D no issues. Driving Monday heard spinning whining gear mesh /unmesh sound. Neutral only. Trans fluid good, religiously change fluid /filter.
I have internal NSBU. Is it worth changing ? Also 2771 code. Please advise, Transfer case ? NSBU?, ??
Thanks
 
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