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There is no mixing and matching of crown wheel and pinions. No competition ratios. For example, if you are running a front-loading Ford axle your ratios should be either a 4.4, 4.1, 3.9, 3.8, 3.7 or a 3.5
If you are running a Cortina axle then you should be on Cortina ratios.
Please note that differentials will be taken out at the National Championship Weekend for checking.
Thank you.
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