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Supplied Vehicle Information for ZONF23N
"Removal of the factory rear block is required. Net rear height gain will vary based on size of the factory block, but will typically result in a level stance.
If equipped with a 2-piece rear drive shaft, then a driveshaft alignment kit may be required. It is available in the optional accessories (part #F5401).
Rear box kit not designed for dually models.
Front exhaust modification may be required to clear the front driveshaft on gas models.
4"" System Only - Although rare, if your vehicle is equipped with both a stock 4"" rear block and a top mounted overload spring, four of u-bolt part number UBT4235 may be required.
6"" System Only - Although extremely rare, front drive line vibration may occur."