You're picking a transmission for a serious build. Two heavy-duty GM options: TH400 and 4L80E. Both are bulletproof when built. Here's how to choose.
Quick comparison
TH400:
- 3 forward gears (no overdrive)
- 1965-1990 production (cores plentiful)
- Bulletproof, race-proven
- Hydraulic control (no electronics)
- ~450 ft-lb stock, 1000+ built
4L80E:
- 4 forward gears (overdrive)
- 1991-2010 production
- Bulletproof, modern electronics
- Electronic control
- ~430 ft-lb stock, 800+ built
Key differences
Overdrive
- TH400: No overdrive — high RPM at highway cruise
- 4L80E: Has overdrive — better fuel economy at cruise
Electronics
- TH400: No electronics, mechanical TV/governor
- 4L80E: TCM required, solenoid pack, many sensors
Race use
- TH400: Standard for serious drag race
- 4L80E: Used in some race apps, but TH400 dominates
Street use
- TH400: Acceptable but high RPM cruise
- 4L80E: Better for street/strip
Cost
- TH400 build: $1,500-6,000 depending on level
- 4L80E build: $2,500-8,000 depending on level
Aftermarket
- TH400: Huge race aftermarket
- 4L80E: Growing race aftermarket
When to pick TH400
Choose TH400 for:
- Race-only or drag-only builds
- Maximum simplicity (no electronics)
- Maximum strength per dollar
- Old-school hot rods
- Trans brake applications
Read our TH400 transmission guide
When to pick 4L80E
Choose 4L80E for:
- Street/strip combinations
- Tow rigs
- Modern engine swaps with ECM control
- Daily driver that you want to handle power
- When you want overdrive
Read our best 4L80E rebuild kit guide
The bottom line
Race only: TH400
Cheap, simple, proven, no electronics to mess with.
Street/strip: 4L80E
Modern, overdrive, electronic control, almost as strong.
Tow rig: 4L80E
Overdrive at cruise, HD enough.
Hot rod: depends
Older traditional hot rod = TH400 with TV cable considerations.
Modern restomod = 4L80E.
Need TH400 or 4L80E parts? Shop our TH400 catalog or 4L80E catalog. Master kits, race parts, complete rebuilds. Free shipping over $70.
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