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Service bulletin 121039

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 id10022856
Published by NHTSA2007-10-01
Manufacturer's number121039
Manufacturer's date2007-08-31
NHTSA componentSUSPENSION:FRONT:SPRINGS:LEAF SPRING ASSEMBLY:HANGER,BRACKET

NHTSA's summary

LOWER FRAME FLANGE CRACKS - MRU AND MR MODELS. CRACKS MAY DEVELOP IN THE LOWER FRAME FLANGE OF THE RIGHT-HAND FRAME RAIL ON MR MODEL CHASSIS. *NJ

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
MACK MR

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