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I need 3.90 or 4.10 rear diff

Old Nov 25, 2008 | 01:10 PM
  #26  
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Originally Posted by morkusyambo
Anybody know what rpm the car would be at with these different diff. ratios @70mph??

What about max speed in 2nd and 3rd gear??
For the difference between rpms at a given speed between 4.44 and 3.9 multiply your current rpm by .8773. That would be rather accurate.

Paul.
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Old Nov 25, 2008 | 01:30 PM
  #27  
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From: Schaumburg, IL
Shouldn't that be .8783? Actually .8784 if you round the last digit up? j/k Close enough.
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