Ok I just traded my ford for my blazer now it wont shift into 3rd or overdrive just starts to slip and slow down do you think it needs a rebuild or could it be something else its a 90 blazer s-10 v6 4.3L automatic 700R4 4x4 if anybody can help

 

No 3rd or 4th gear is indicative of a damaged 3-4 clutch pack. It would seem that a rebuild is in your future.

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