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Old 04-02-2014, 11:18 PM   #4
Captainfab
60-66 Nut

 
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,246
Re: 1965 Chevy 1/2 to Rear End Gear Ratio

The differential is one of the most neglected parts of a vehicle. More than likely the 12 bolt under your '65 could use a oil change. Just pull the cover, drain the oil and have a look and see what gears you have. The tooth count is stamped on the edge of the ring gear. That way, you will also be able to visually check the condition of the inside of your differential and you will know for certain what gears you have. Plus then you will have the peace of mind knowing that your differential is full of fresh oil. It'll only cost you a couple quarts of gear oil and a cover gasket.
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