1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Best diff ratio for 1/4 mile?

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Old 07-11-04, 12:58 PM
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Best diff ratio for 1/4 mile?

Help,I would like advice on my diff ratio.I have a 12A turbo,TII gearbox,3.9 diff ratio,26" hoosiers.Ran 11.7 at 125mph,in 3rd gear.
I changed the diff ratio to 4.875,I now cross the line in 4th,7500rpm,at 122mph,12 sec ET.My car is slower!
What ratio would you use,and why?
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