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Old 03-29-2013, 10:39 AM
  #4981  
SS LS1
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Originally Posted by mxgregg
How do you figure out the FDR? I always thought you divided the spur gear by the pinion size?
Close, it's spur divided by pinion multiplied by the transmission ratio of the car (1.94 for the 417 chassis).

So for Joey's example it would be 90/43 * 1.94 = 4.06 FDR
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