The Chevrolet 350 small block engine is one of the most popular and versatile V8 engines ever produced. Found in everything from classic muscle cars to pickup trucks and hot rods, the 350 small block Chevy (SBC) is known for its durability, power potential, and massive aftermarket support. One of the most common questions enthusiasts ask is: what transmission can hook up to a 350 small block?
The good news is that the 350 SBC is extremely transmission-friendly. Over the decades, GM designed many manual and automatic transmissions that bolt directly to it, and modern adapters make even more options possible.
What Transmission Can Hook Up to a 350 Small Block?
Understanding the 350 Small Block Bolt Pattern
Before choosing a transmission, it’s important to understand the bellhousing bolt pattern. Most Chevy 350 small block engines use the Chevrolet small block / big block bolt pattern, which remained largely unchanged for decades. This means many GM transmissions can bolt directly to the engine without adapters.
However, you still need to consider:
- Automatic vs manual transmission
- Vehicle weight and intended use
- Horsepower and torque output
- Drivetrain layout (2WD or 4WD)
Automatic Transmissions That Fit a 350 Small Block
1. TH350 (Turbo Hydra-Matic 350)
The TH350 is one of the most popular automatic transmissions for the 350 SBC.
Why it’s popular:
- Direct bolt-on compatibility
- Lightweight and compact
- Handles moderate power levels
- Easy to rebuild and inexpensive
This 3-speed automatic is commonly used in classic cars, hot rods, and street builds.
2. TH400 (Turbo Hydra-Matic 400)
The TH400 is a heavy-duty 3-speed automatic designed for higher torque applications.
Best for:
- High-horsepower builds
- Trucks and muscle cars
- Drag racing applications
While it’s heavier than the TH350, it’s extremely strong and reliable.
3. 700R4 / 4L60
The 700R4 (later renamed the 4L60) is a 4-speed automatic with overdrive.
Advantages:
- Bolts directly to a 350 SBC
- Overdrive gear improves highway fuel economy
- Lockup torque converter for lower cruising RPM
This transmission is ideal for street cars and daily drivers using a carbureted or fuel-injected 350.
4. 4L60E
The 4L60E is an electronically controlled version of the 4L60.
Things to consider:
- Physically bolts to the 350
- Requires a transmission control module (TCM)
- Often used with fuel-injected engines
It’s a good choice if you’re building a modern restomod or EFI-converted vehicle.
5. Powerglide
The Powerglide is a 2-speed automatic transmission.
Why people use it:
- Extremely strong in racing form
- Simple design
- Common in drag racing
While not ideal for street driving, it’s a proven performer at the track.
Manual Transmissions That Fit a 350 Small Block
1. Muncie 4-Speed (M20, M21, M22)
Classic muscle cars often paired the 350 SBC with a Muncie 4-speed manual.
Features:
- Direct bolt-on
- Strong and period-correct
- Highly collectible
The M22 “Rock Crusher” is especially popular for performance builds.
Must Read: What Ford Vehicles Used an E40D Transmission in 2001?
2. T5 Manual Transmission
The Borg-Warner / Tremec T5 is a lightweight 5-speed manual.
Best for:
- Street rods
- Light vehicles
- Moderate horsepower builds
Some versions require a compatible bellhousing, but many are commonly used behind a 350.
3. T56 6-Speed Manual
The T56 is a modern 6-speed manual transmission.
Benefits:
- Excellent gear ratios
- Double overdrive for highway cruising
- Handles higher power levels
It usually requires an aftermarket bellhousing, hydraulic clutch setup, and some fabrication.
4. NV3500 and NV4500 (Truck Transmissions)
For truck applications, the NV3500 and NV4500 manual transmissions are popular.
Ideal for:
- Pickup trucks
- Off-road builds
- Towing applications
The NV4500 is especially known for its strength and durability.
Things to Consider Before Choosing a Transmission
When selecting a transmission for your 350 small block, think about:
- Intended use: Street, racing, towing, or off-road
- Power level: Stock vs high-performance
- Rear axle ratio
- Budget and availability
- Electronic vs mechanical controls
Also remember that installing a transmission may require additional parts such as:
- Torque converter or clutch
- Flexplate or flywheel
- Crossmember
- Driveshaft modifications
Final Thoughts
The Chevrolet 350 small block is one of the most adaptable engines ever built, and that flexibility extends to transmission choices. From classic automatics like the TH350 and TH400 to modern options like the 4L60E and T56, there is no shortage of transmissions that can hook up to a 350 SBC.
Whether you’re restoring a classic muscle car, building a street cruiser, or assembling a high-horsepower project, there’s a transmission that fits your goals. Choosing the right one comes down to how you plan to use your vehicle and how much power you want to handle.