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There are a few reasons for swapping the stock crossmember with CPP’s drop center piece. One is that CPP moves the front pivot point of the trailing arms up four inches to correct the driveshaft’s pinion angle. This is necessary because of the 5-inch drop. If the rearend was to move five inches up without changing this pickup point, the pinion of the rearend would be pointing towards the ground at way too drastic of an angle for the driveshaft not to bind. CPP has also made allowances for a 3-inch exhaust tube to run through the crossmember, further increasing ground clearance over the stock crossmember which forced the exhaust to run underneath the truck. Crescent cutouts on either side also allow for clearance of fuel, brake, air, and electrical lines to run inside the framerail. Though our truck is a long bed, the drop center crossmember is designed to work with both one- and two-piece driveshaft pickups.