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High Performance Rear Ends
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Must be a truck because the car 12 bolt didn't come out until '65. Remove the cover and count the teeth on the ring gear and the pinion gear. Divide the number on the ring gear by the number on the pinion gear. 41/11=3.73 Probably needs an oil change anyway.
 

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High Performance Rear Ends
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3,782 Posts
If this is a truck 12 bolt with 3.73 gears then you also have a 4 series differential. I don't know what you have planned, but that is something that you will need to know if you are going to do a gear swap.
 
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