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Fresno State Bulldog
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5,708 Posts
Well, I'm just going by what happend to me, I needed one for my 10" Whiplash....I dunno about the NBS but it would seem to me that anything over an 8" lift would need a longer driveshaft... :shrug:
 

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Drive It Like Ya Stole It
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6,656 Posts
Yes you will need it, anything over 6" of diff drop needs it, the old one just physically isnt long enough. The 6" kitys make up for it by rotating the diff some, you cant do that enough for a bigger lift.
 
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