mcd

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if its not spinning when you give gas then it will be the diff its a common thing with these front diffs there is a much stronger one now from mcd it will be the pins or the planetary gears open it up and you will see what i mean you could also check the dog bone to the diff
 
could also be something very simple like a loose wheel nut!

always make sure they are real tight.
the fg's will loose one wheel on the diff drive when wheel nut loose.
 
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