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rear end ratio

663 Views 5 Replies 4 Participants Last post by  big gear head
Can you figure out the ratio buy spinning drive shaft by hand and counting times rear tire turns around. I tryed and got drive shaft one revolution and 1.25 on the tire. Maybe i did something wrong it is in 1971 malibu build sheet says it has a 2.56 rear end.
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I just rebuilt motor and tranny in # matching 71 malibu put 202/160 valves in heads to keep original heads mild cam 9.15-1 comp. and i'm getting 16 mpg on highway but i get that mileage with my big block impala 427 4-speed 3.73 gears. Do i need to get higher gears in chevelle to get into power band on motor?
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