I am going to put a plow on my truck and want to replace my torsion bars on my '03 f-150 with heavy duty ones. Does anyone know what the spring codes are for torsion bars that come with a 7700lb payload package? My front GAWR is 3600 and I believe the 7700lb payload package provides a GAWR of 4100lbs. Also my spring code is N6. The ford dealer was no help.
Thanx