My g80 busted as expected and no where local has the 05-06 drum brakes to clear a 15" wheel so my question is how hard will it be to swap an obs rear end like a 4wd rear in an 04. Besides probably cutting the perches and maybe moving will the lines bolt back up to the drums or have go change fittings and the yoke on the obs rear fit my u joint?

 

Anybody?

 

99-07 classic 10 bolts are similar and will bolt in with a few differences.

To answer your question more directly yes, an 04 will bolt in. The flange where the brakes bolt up will be rotated 45* compared to the flange on the 05 up. Same offset in relation to the axle.