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they are the same thing only difference is what year they are for. chipping is for the tbi trucks pre 95
 

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not sure on what year but from what i can tell the obs pcm needs to be sent into a tuner like blackbear or nelson, or you can order one from them. they tune it and send it back.

another option is to find some one local to tune for you but not sure about where to look.
 

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Or do the 0411 pcm swap
 
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