7.5 or 8.5 rear end???

1978chevymalibu

Daily Driver
Sep 2, 2010
17
0
0
Goodyear arizona
i got a 78 chevy malibu wondering if it has a 7.5 or 8.5 rear end it is a 10 bolt and i counted the gears it has 21 pinion teeth and 48 ring gear teeth i havent taken it out yet does anybody no for sure what they come with
 

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