# Service bulletin 20NA078

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: 10184484
- Published by NHTSA: 2020\-12\-21
- Manufacturer's number: 20NA078
- Manufacturer's date: 2020\-11\-23
- NHTSA component: EQUIPMENT ADAPTIVE/MOBILITY; POWER TRAIN:CLUTCH ASSEMBLY; EQUIPMENT

## NHTSA's summary

This technical bulletin provides a procedure to replace the 4 5 6 clutch housing if the bushing was found worn and the cause of the customers concern.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10184484-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10184484-9999.pdf)

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

## Components

Equipment and accessories, Transmission and driveline, Clutch

## Vehicles listed

- 2019 to 2021 CHEVROLET EXPRESS
- 2019 to 2021 CHEVROLET SILVERADO 1500
- 2019 to 2021 CHEVROLET SILVERADO 2500
- 2019 to 2020 CHEVROLET SILVERADO 4500
- 2019 to 2021 CHEVROLET SUBURBAN
- 2019 to 2021 CHEVROLET TAHOE
- 2020 GMC SAVANA
- 2019 to 2021 GMC SIERRA 1500
- 2020 to 2021 GMC SIERRA 2500
- 2019 GMC SIERRA DENALI
- 2019 to 2021 GMC YUKON
- 2019 to 2021 GMC YUKON XL

## Other bulletins for the same vehicles and component

- [20NA078](/bulletins/10174296.md), 2020-04-27, Service bulletin: POWER TRAIN:CLUTCH ASSEMBLY:BELL HOUSING. This technical bulletin provides a procedure to replace the 4 5 6 clutch housing if the bushing was found worn and the cause of the customers concern.

JSON: [/v1/bulletins/10184484](/v1/bulletins/10184484)

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