Re: Where do the headlight grounds go?
If its still got the original rear diff, it will be a 12 bolt. If you look on the axle tubes you should see some stampings that will lead you to the original gear count. You can always pull the cover and look at the gears themselves as they are stamped also. (chart attached so you can decipher the rear code)
The 12 bolt gears are the same as are the seals, bearings...etc.
The only difference is the 63-early 64 using a 17 spline axle vs the later models using 30 spline.
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