NPR and NQR; W35/3500, W4, W45/4500, and W55/5500; Rear
NRR and 5500XD (2005-2022); Rear
- Includes stripped and Flatlow low-profile chassis
NPR (Isuzu) and W4 (Chevrolet/GMC) 1986-1995
- Through June 1995 for diesel engines; through September 1995 for gas engines.
- From January 1989, the 56-105 and 56-109 springs use a different pad arrangement.
- Discard the 6mm pad from the 56-105 or 56-109 springs and reuse the 8mm pad and sway bar bracket from the old spring.