8.75 Spring perch Relocation Measurements

All the inboard kits move the spring in roughly 3 inches per side. Depends on where you place the front Box/Hanger. But 3 inches is the measurement. So move the perches in 3 inches of their factory location for an a body. 43.02 factory a body spring pad width on housing. So your total width will be 37.2 after moving them each 3 inches.

Keep in mind the spring pads/perches must be turned the same and be level with each other after pinion angle is set. Set the pinion angle and weld the right perch. Then remove the housing, level the pads and weld the left. This will properly preload the left spring when tightening the u bolts with SS springs.