Heardatbeat
Well-known member
Good afternoon everyone. I got a '71 Mach 1 that the previous owners swapped an 8 inch in place of the original 9 inch (learned from help here and the Marti Report). Well I finally got a good deal on a 9 inch from someone local to me all he knew was that it was from a pickup $150 for the housing, center and axles. After some cleaning I found the bucktag and found out it came from a 70's F-100 it measures 61 inches from flange to flange. After some more help from one of the 7123 FB groups I found out the spring perches are on the top instead of bottom because pickups had the leaf spring on top as opposed to the leafspring coming from the bottom on a Mustang. So my question to ya'll is can anyone measure their original 7123 9 inch housing diameter please? I want to know if it's going to be similar enough for minimal work. I know I have to cut the perches and re-weld them to the bottom. I'm also concerned about the staggered shocks plate. If the housing is bigger the plate theoretically should not bolt up right?