S-Series Vehicles
Includes 1000 to 8000 Series, Amtran, and IC:
Rear Single Axle
- Main Springs:
- 12-S Series:
- Models from 1978-1988
- 1400 to 1652 Series:
- Models from 1987-2012
- 2554 to 2674 Series:
- Models from 1989-2002
- 3000; 3400 to 3900 Series:
- Models from 1989-2004
- 4500 to 4900 Series:
- Models from 1989-2003
-7100; 8100 to 8300 Series:
- Models from 1988-2003
Amtran Models:
- Genesis, Amtran FE, and RE; IC CE, FE, and RE models up to 2004
Spring Types:
- Radius leaf type springs (variable rate) with bronze (RNG) eye leaf bushing
- Later model trucks use similar springs with rubber (RB-259) eye leaf bushing
Notes:
- Some models use identical springs except for eye leaf length and bushing type (RB-259).
- Certain heavy-duty S-Series models use springs with eyes on both ends.
- Some 2000 and 8100 to 8300 Series models use springs with torque rods (3.5" wide).