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To know for sure, You need to remove the big metal plate on the rear end housing and count the # of teeth on the BIG round gear / Ring gear. Then count the teeth on the small round gear / pinion gear that sets deep in the housing and runs on the big gear. Then divide the small # into the high # and that will be you gear ratio.

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Q: How do you tell rear end ratio on 1978 Chevy truck?
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