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Looking for Ac-Delco U-joints diagram

You should probably call them, but here's how they're numbered in the Neapco catalogue...

Position #1 is rear output at the transfer case.
Position #2 is rear output at the axle
Position #3 & #4 is front output, Double Cardan joint at the transfer case
Position #5 is front output at the axle
Position #6 & #7 is front axle behind the wheels.

That seems to be pretty standard for most catalogues I've seen, but there can be variations (for instance, the rear driveshaft can be numbered #1, #2, & #3 in case there's a Double Cardan at the forward end, and bump the other numbers up by one.)

So, I'd give them a call.
 
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