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Changing G10 / 20's rear wheel pattern from five to six lug.
Pathfinder Chevrolet G10, G20 and GMC 1500, 250, Astro/Safari series vans have 6 on 5-1/2 wheel lug pattern on the front axle and 5 on 5.0 on the rear axle, with a spare rim that was manufactured with both lug patterns.
Remove the rear axle shafts and have the flanges redrilled to except the 6 on 5-1/2 wheel pattern. One of the original stud holes will need to be plug welded because one of the new and one of the old stud holes will overlap. The brake drum can be redrilled as well. A good 4wd or speed shop can perform this modification for a reasonable cost. Replace all the wheel studs. Refer to a shop manual for the proper differential tear down procedures.
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