# Service bulletin SIL\-16\-WT\-20

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: 10232783
- Published by NHTSA: 2023\-03\-13
- Manufacturer's number: SIL\-16\-WT\-20
- Manufacturer's date: 2023\-01\-30
- NHTSA component: STRUCTURE

## NHTSA's summary

Service letter providing notice of redesigned piston seals and piston, air solenoid valve nipple, and air solenoid valve fitting

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10232783-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10232783-9999.pdf)

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

## Components

Body and frame

## Vehicles listed

- ALLISON 3000 SERIES TRANSMISSION
- ALLISON 4000 SERIES TRANSMISSION
- ALLISON B SERIES
- ALLISON B300
- ALLISON B400
- ALLISON H 40 EP TRANSMISSION
- ALLISON H 50 EP TRANSMISSION
- ALLISON T SERIES

JSON: [/v1/bulletins/10232783](/v1/bulletins/10232783)

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