Axle Swap to upgrade to a 4.5" BP

Here is a simple way to do it.

Re-drill your 8 3/4 drums to 4.5 as they self center on the center register.

Then install the install the 4.5 wheel studs into the axle.

Got a machinist friend to help with it, that would be good.

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I'm trying to figure out where the original 5th hole was on that flange. Looks like it would be in the middle of the big hole for access to the flange bolts. Do you know if any holes were welded up or do some axles come from the factory with only stud holes drilled for the sbp and no other holes? Thank you.