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Home / Transmissions / General Motors / 3L80
General Motors Source-verified model

General Motors 3L80

3-speed automatic gearbox THM (Turbo Hydromatic) 400, also named as 3L80). Turbo-Hydramatic is a patented name for the family of automatic gearboxes designed and produced by GM.

Speeds 3
Type AT
Drive RWD
Max torque 340
ATF capacity (L) 12
ATF change (L) 5
ATF type Dexron III
3L80
6.3
Support & Market Presence Index
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How widely this transmission is used, documented and supported across the Go4Trans graph.

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Other and alternative codes of this transmission

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M40
TH400
3L80
TH-400
TH 400
verified naming OEM designation source name

Common problems & symptoms

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Problems and symptoms reported for this transmission, compiled from repair sources. Not a complete list.

No symptoms recorded yet.

⬡ Support & Market Presence Index
6.3
/10
Well covered
How widely this transmission is used, documented and supported across the Go4Trans graph.
Market presence
9.9
How widely this unit is fitted across vehicle platforms and model years
Documentation depth
0.0
How thoroughly known failure modes are catalogued for this unit
Knowledge & support
5.8
Volume of manuals, TSBs and reference material indexed for this unit

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About this transmission

Transmission general data

3-speed automatic gearbox THM (Turbo Hydromatic) 400, also named as 3L80). Turbo-Hydramatic is a patented name for the family of automatic gearboxes designed and produced by GM.

Technical issues and repair guidelines

This gearbox 3L80 has a simple and reliable design. All parts are made of solid materials. Shifting of gears is implemented very smoothly and almost unnoticeable. The main disadvantages of this automatic transmission are significant dimensions and weight of the transmission. This transmission is considered to be the most reliable in the history of GM (the most enduring).

Vehicle fitment explorer

Confirmed vehicle applications. Every row is drawn from our source-verified fitment database.

Make Model Year Drive Engine
Chevrolet/GM H1 HUMMER 92 3 SP 4WD V8 6.2L DIESEL

Sources & Contribution

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Every claim on this page is backed by a structured source record — including community contributions, each with its own reference.

Type
Title
Author
Link
video
It's A How To Not Do Everything Kinda…
TattsForLife
manual
en.wikipedia.org
—
manual
makcotransmissionparts.com
—
manual
sonnax.com
—

Contribute transmission data

Go4Trans grows as a community knowledge graph. Help make the 3L80 record more complete — every submission is reviewed before publication.

✓ Reviewed by our editorial team before going live
✓ Accepted contributions are credited in the Sources list
📋 Alias or code variant
🔩 Part number & fitment
🚗 Vehicle application
🏪 Repair shop listing
📖 Technical article
⚠ Problem report