# Service bulletin TT7399EN

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.

- Type: Service bulletin
- NHTSA id: 10156780
- Published by NHTSA: 2019\-04\-08
- Manufacturer's number: TT7399EN
- Manufacturer's date: 2013\-10\-02
- NHTSA component: POWER TRAIN

## NHTSA's summary

Tech Tip concerning Transmission Control Module \(TCM\) Recalibration for Kenworth

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2013/MC-10156780-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2013/MC-10156780-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Transmission and driveline

## Vehicles listed

- ALLISON 4000 SERIES TRANSMISSION

JSON: [/v1/bulletins/10156780](/v1/bulletins/10156780)

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