CHEAPest way to convert rear axle bolt pattern to big bolt pattern???

go with #4 ,BUT I just did mine on my 66 dart and they had to slug the hole that you took the axle flange nuts off with. in order to give enough meat to have 1/2 inch screw in studs . one of the studs comes within 1/4 inch of the hole, now I have to put the nuts on using a wrench. no big deal since I just put on new bearings and won't have to touch it for a few years.

(edit) I had all the Drums from both the 9" and the 10" rear plus the axles plugged and the front hubs redrilled , all that cost me a total of 75.00. I did supply the screw in studs for all 4 hubs and axles.

the new bearings cost me more than getting the drilling conversion done. $121.00 =bearings and seals for front and rear. I just looked at a friends 7 1/4 LBP and it has just a little more meat than my redrilled axles and I can get the hole put back in for the flange nuts without weakening the stud locations.