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Service bulletin SF179A

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id612099
Published by NHTSA2000-06-05
Manufacturer's numberSF179A
Manufacturer's date1999-09-01
NHTSA componentSUSPENSION:REAR

NHTSA's summary

SOME VEHICLES WERE BUILT WITH 12K REAR SPRINGS INSTEAD OF 10K REAR SPRINGS. THIS CAUSES THE BODY TO BE TOO HIGH FOR THE STANDARD FEDERAL EXPRESS LOADING PLATFORMS. THE MODIFICATION CONSISTS OF INSTALLING A NEW 10K REAR SPRING ASSEMBLY. *TT

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Suspension

Vehicles listed
FREIGHTLINER MT451998 to 1999

Listing a model year does not mean every vehicle of it is concerned: the document says which.