Also, the shared article says I must change my spring perches if I do the 55-58 pumpkin swap. Why would I need to change my spring perch if I’m using
My original stock differential housing, if I’m just swapping the pumpkin?
On your rear axle there are mounts that let the axle housing swivel up and down. The torque is resisted by –- wait for it –- the torque tube around your driveshaft. With an open driveshaft the springs resist the torque and need to be solidly attached to the axle tubes. The pivot mounts can’t do that.
