# Service bulletin SIL 20\-1K2K\-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: 10184049
- Published by NHTSA: 2020\-12\-14
- Manufacturer's number: SIL 20\-1K2K\-20
- Manufacturer's date: 2020\-11\-13
- NHTSA component: EQUIPMENT; POWER TRAIN:AUTOMATIC TRANSMISSION; EQUIPMENT ADAPTIVE/MOBILITY

## NHTSA's summary

Announces re\-design of the C1 piston seal ring

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10184049-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10184049-9999.pdf)

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

## Components

Equipment and accessories, Transmission and driveline, Automatic transmission

## Vehicles listed

- ALLISON TRANSMISSION

JSON: [/v1/bulletins/10184049](/v1/bulletins/10184049)

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