What am I doiing wrong with my measurements? My perches measure 43" center to center but the drum surface to drum surface on three 8-3/4" rear axles and six 7-1/4" rear axles, all removed from A-bodies mesure 58-1/2". I never actually measured before but when I walked by one after reading this thread I decided to get my tape. After getting 58-1/2 I knew it wasn't what the chart called for so I measured the one under my car. 58-1/2" too. ( but it has aftermarket axles.) So then I went to the pile of 7-1/4s and get the same measurement. Then I measured the third 8-3/4 and it too is 58-1/2". Do I have a faulty tape measure??
