Chevrolet Express 2019–2021 — technical service bulletin
Bulletin 20NA078 · NHTSA communication 10184484 · issued Nov 23, 2020
Technical service bulletin
communication type
Equipment
component
2019–2021
model years
30
vehicle entries
Official 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.
Vehicles covered
- 2019 Chevrolet Express
- 2020 Chevrolet Express
- 2021 Chevrolet Express
- 2019 Chevrolet Silverado 1500
- 2020 Chevrolet Silverado 1500
- 2021 Chevrolet Silverado 1500
- 2019 Chevrolet Silverado 2500
- 2020 Chevrolet Silverado 2500
- 2021 Chevrolet Silverado 2500
- 2019 Chevrolet Silverado 4500
- 2020 Chevrolet Silverado 4500
- 2019 Chevrolet Suburban
- 2020 Chevrolet Suburban
- 2021 Chevrolet Suburban
- 2019 Chevrolet Tahoe
- 2020 Chevrolet Tahoe
- 2021 Chevrolet Tahoe
- 2020 GMC Savana
- 2019 GMC Sierra 1500
- 2020 GMC Sierra 1500
- 2021 GMC Sierra 1500
- 2020 GMC Sierra 2500
- 2021 GMC Sierra 2500
- 2019 GMC Sierra Denali
- 2019 GMC Yukon
- 2020 GMC Yukon
- 2021 GMC Yukon
- 2019 GMC Yukon XL
- 2020 GMC Yukon XL
- 2021 GMC Yukon XL
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.