# Service bulletin SIL 21\-1K2K\-21 R

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: 10236692
- Published by NHTSA: 2023\-05\-30
- Manufacturer's number: SIL 21\-1K2K\-21 R
- Manufacturer's date: 2023\-04\-26
- NHTSA component: POWER TRAIN

## NHTSA's summary

Announces part changes to commonize parts for certain 6\-speed and 9\-speed transmissions

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10236692-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10236692-9999.pdf)

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

## Components

Transmission and driveline

## Vehicles listed

- ALLISON DIV ALLISON DIV

JSON: [/v1/bulletins/10236692](/v1/bulletins/10236692)

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