2020-2026 Silverado HD & Sierra HD

The heavy-duty headquarters. Discussion for the 2500HD and 3500HD. Towing, payload, ordering, and daily driving.

Followers 29

Subforums

Troubleshooting, Warranty & Recalls

The repair shop. Diagnose emissions codes, electrical issues, Allison transmission behavior, and recall updates.

8.8k

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Modifications & Accessories

Bumper replacements, 5th wheel hitches, auxiliary lighting, and suspension upgrades for your workhorse.

11k

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6.6L Duramax Diesel (L5P)

The torque monster. Tuning, maintenance, and exhaust discussion for the L5P Duramax and 10-speed Allison transmission.

2.2k

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6.6L Gas V8 (L8T)

The iron-block workhorse. Tech and reliability discussion for the 6.6L L8T V8 and the 6-speed / 10-speed heavy-duty transmissions.

5.6k

posts

1,790 topics in this forum

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2020 Sierra HD AT4

By mookdoc6, January 23, 2019
- 11 replies
- 3.8k views
- bhales
- January 23, 2019
2019 RAM Heavy Duty

By Sierra Dan, January 14, 2019
- 12 replies
- 2.1k views
- Colossus
- January 20, 2019
Has anyone seen a 2020 GMC Sierra HD ? 1 2

By massbowtie, January 10, 2019
- 18 replies
- 3.4k views
- EXSlider400
- January 20, 2019
2020 Sierra HD Teaser

By sk, January 18, 2019
- 2 replies
- 970 views
- SilveradoX2
- January 18, 2019
Here It Is.... 2020 Silverado HD High Country In The Flesh

By Sierra Dan, January 15, 2019
- 1 reply
- 1.6k views
- wforrest08
- January 17, 2019
My HD grille fix

By DTB, December 7, 2018
- 4 replies
- 4.3k views
- racetrk
- January 6, 2019
2020 HD's

By Riverjet502, December 17, 2018
- 4 replies
- 2.6k views
- grizzlyltz
- December 29, 2018
2020 HD at Chicago Auto Show?

By brclark82, December 12, 2018
- 2 replies
- 1.5k views
- redwngr
- December 16, 2018
The High Country trim Chevrolet Silverado HD dials back the bold 1 2
By Joe's 2017 Silverado, December 6, 2018
- 2020 chevrolet silverado hd
- 20 replies
- 4.1k views
- i82much
- December 10, 2018
Any new news on GM retiring the 6.Dinosaur ? 1 2 3 4 6

By f8l vnm, May 30, 2018
- 79 replies
- 19.9k views
- Princess_jamie
- December 6, 2018
Possible silverado hd zr2 concept?

By Payton34, November 2, 2018
- 3 replies
- 2k views
- Crazy Schooner
- November 3, 2018
First 2020HD picture released by GM media 1 2

By redwngr, April 12, 2018
- 23 replies
- 9.4k views
- Jollygreengiant
- November 1, 2018
2020 Silverado HD

By Brent Darting, May 8, 2018
- 6 replies
- 4.4k views
- Colossus
- October 26, 2018
2019 Sierra......No.

By Mountain motor, August 27, 2018
- 4 replies
- 2k views
- Mountain motor
- October 25, 2018
No 2019MY double or reg cab HD's? 1 2

By redwngr, March 25, 2018
- 17 replies
- 7.7k views
- revrnd
- May 9, 2018

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