spider or side gear swap

[oldsnakebite]

Here's a strange one! are the side gears on my 64 12 bolt 3.73 rear end the same as in a 1969 12 bolt 3.08 rear end? I know the 64 is 17 spline and the 69 in 30 spline, but are the teeth the same. The reason I ask, I plan to install the 69 rearend 3.08 in my 64 truck, but my 64 rear end already has redrilled axles and the 69 have 6 lug axles. If the side gears would swap out, all I do is swap the side gears and axles to the 69 and I'm ready to go! Maybe? Or if not, redrill the 6 lug axles to 5 lug, but have not found anyone that can do it. Or just buy new 5 lug axles at $125 each. Thanks Marty