Our readers keep the lights on and the garage heater humming. As an Amazon Associate, I earn from qualifying purchases.
Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
Buying a torque converter for your TH350 means choosing a stall speed that actually matches your camshaft, your rear gears, and how you drive — pick wrong and you’ll either bog off the line or hate every stoplight. This guide breaks down the nine most relevant Turbo 350 torque converter options on Amazon, focusing on real stall numbers, fitment, and the durability that matters when you’re building a street or strip machine.
I’m Mo Maruf — the founder and writer behind GoCarLife. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
To get the right turbo 350 torque converter, you need to match its stall speed (the RPM where the converter starts transferring power) to your engine’s power band and how you drive. Match the stall speed to your camshaft and driving style to avoid bogging or a sloppy daily driver.
Our Picks at a Glance
How To Choose The Best Turbo 350 Torque Converter
Every TH350 torque converter balances stall speed, physical size, and strength. You need a unit that lets your engine build RPM before the car starts moving, but not so much that you’re slipping constantly during normal driving.
Match Stall Speed to Your Camshaft
Stall speed is the RPM where the converter begins transferring power to the transmission. A mild street cam with a low idle vacuum wants a converter in the 1900-2500 RPM range so it stays livable in traffic. A bigger cam needs a higher stall to keep the engine from bogging when you hit the gas. A 2700-3000 RPM stall suits a performance cam, not a stock small block.
Consider Physical Diameter and Bolt Circle
Torque converters come in 10-inch and 12-inch diameters. A smaller 10-inch unit is lighter and typically has a higher stall speed, making it the choice for performance builds. A 12-inch converter is heavier, more street-friendly, and generally has a lower stall since it multiplies torque better at low RPM. You must also match the bolt circle — the pattern that bolts to your flexplate — which is listed in inches for each converter.
Quick Comparison
| Model | Best For | Stall Speed | Diameter | Weight | Amazon |
|---|---|---|---|---|---|
| JEGS 555-60400★ Best Overall | Balanced street & track | 2300-2700 RPM | 10.75 in. Bolt Circle | 26.8 lb | Amazon |
| B&M Tork Master 20400Direct-Fit Pick | Direct-fit street upgrades | 1900-2100 RPM | 10.75 in. Bolt Circle | 14.36 kg | Amazon |
| Allstar ALL26900High-HP Pick | High-horsepower builds | 2700-3000 RPM | 10 in. | 22.4 lb | Amazon |
| TCI 241500A | Mild street cams | 1600-2000 RPM | 12 in. | 15.876 kg | Amazon |
| Hughes GM25 | Street/strip balance | 2500 RPM | 10.750 in. Bolt Circle | 32 lb | Amazon |
| Allstar ALL26902 | Budget performance | 3200-3500 RPM | 10 in. | 23 lb | Amazon |
| B&M 400001 | Track-oriented builds | 2700-3000 RPM | 10 in. | 23.4 lb | Amazon |
| Assault Racing 600000 | Budget street swaps | 2200-2600 RPM | 12 in. | — | Amazon |
In‑Depth Reviews
1. JEGS 555-60400 Torque Converter
Our pick — 4.5★ from 100+ verified ratings; the strongest balance of quality and price.
The do-everything stall that wakes up a mild small block without ruining the commute.
For a small block Chevy making up to 500 horsepower without nitrous or forced induction, this JEGS converter is the balance. Its 2300-2700 RPM stall speed (the engine RPM at which the converter locks up) pairs with a street cam, giving you a stronger launch while staying calm at stoplights. The 10.75-inch bolt circle and 30-spline input (the splined shaft that connects to the transmission) are the standard fit for a TH350, and it’s a 26.8-pound unit built in the USA.
Real-world owner feedback backs up the spec sheet. One buyer reports it “brought my Lil 350 to life,” and another confirms it’s held up for years on a built 355 with a TH350. Buyers report a stronger launch and a direct, low-maintenance install.
A few owners noted fitment issues, so verify your flexplate and spline count before ordering. For most street TH350 builds, it’s a proven, reliable choice.
Why It Wins
- Versatile 2300-2700 RPM stall suits street and light track use
- Built for up to 500 hp small blocks without power adders
- Proven durability over years of street driving
What To Check
- A rare fitment issue means verifying your spline count first
- Made in the USA quality but not the lightest option at 26.8 lb
Reach for this if: you want a single converter that handles daily driving and weekend fun without compromise.
Look elsewhere if: you’re running a massive cam with a power adder — you’ll want a higher stall with an anti-balloon plate.
2. B&M 20400 Tork Master 2000
The mild-mannered street upgrade that slides in without drama and stays streetable.
For a near-stock TH350 in a street rod or classic, the B&M Tork Master is about as low-risk as a converter gets. Its 1900-2100 RPM stall (based on a 230 lb-ft torque engine at 2500 RPM) is close to factory behavior but adds a touch more launch authority. It’s a remanufactured unit with a new precision pump drive tube, the 10.75-inch bolt circle you expect, and it’s backed by a 1-year limited warranty.
Owners confirm a perfect direct fit, with one noting it slides right into their TH350. An ASE certified master technician reported the bolts were perfect, the spacing was perfect, and the engagement to the front pump was spot on. City and short highway driving with ~100 miles on the clock showed no problems at all.
There is one documented mismatch: a 455 Grand Prix owner experienced severe slippage after a tech recommended this unit for a 350hp/350 torque application — proof that even a quality converter needs the right engine match. This one is for mild setups, not big torque monsters.
What wins people over: the fitment — six separate owners highlight how perfectly it bolts up, and the functionality gets equal praise for a stock-replacement feel with a hint more bite.
Grab this if: you want a reliable, quality upgrade for a mostly stock street car that you drive daily.
Think twice if: your motor makes well over 350 lb-ft of torque and you’re expecting a dramatic launch change.
3. Allstar Performance ALL26900
A 10-inch screamer that brings a 600hp big block to life without flinching.
This Allstar 10-inch unit is where the stall gets serious. At 2700-3000 RPM, it’s aimed at a warmed-over small block or a big block that needs to build RPM before the tires hook. The lighter 22.4-pound rotating mass vs. a 12-inch converter is a bonus for throttle response, and the painted exterior keeps it looking sharp against a fresh flexplate.
Owner reports read like a who’s who of aggressive builds: one buyer has been “beating on it for a few months” behind a sbc 355 (small block Chevy 355 cubic inch) and says it brought the car to life, while another confirms it “holds up well behind a 600hp bbc” (big block Chevy). Fast shipping and a stall that feels right are the recurring themes.
One owner traced a vibration to the converter after a new engine/trans combo install. It’s an isolated case, but a 2700-3000 RPM unit on a marginal drivetrain can expose balance issues elsewhere.
Our read: the stall range is honest and the durability behind big horsepower is the standout trait — most owners are genuinely impressed.
Best if: you’re running a healthy 350-600hp engine with a cam that wants RPM before launch.
Not for: purely stock motors — the high stall will feel sloppy in stop-and-go traffic.
4. TCI 241500A Torque Converter
The gentle SNS converter that makes daily street driving and easy burnouts feel easy.
TCI’s SNS (Saturday Night Special) 12-inch converter is the most street-friendly of the bunch at just 1600-2000 RPM stall. It’s designed for a stock or mildly modified engine where you want a slightly firmer launch but zero compromise on daily drivability. The non-lockup design keeps things simple, and it’s made in the USA.
Owners pair this with TCI transmissions and report it “makes it quicker to launch and burnouts are a breeze,” while the stall speed doesn’t feel any higher than normal in regular driving. It’s a fantastic match for a TCI Sizzler TH350 and painted to match Streetfighter transmissions straight from the box.
The honest caveat from the data is that at this low stall, you won’t notice a dramatic difference from stock — that’s the point. It’s for someone who wants reliability and a slight edge, not a race-car feel.
Standout spec: the 1600-2000 RPM stall is the mildest here, which is exactly why it’s the right pick for a mostly-stock daily driver.
Pick this if: you want a quality, low-drama converter that improves launch without changing how the car drives the other 99% of the time.
skip it if: your cam idles rough below 1500 RPM — you’ll need a higher stall to keep it happy in gear.
5. Hughes Performance GM25
The machined 2500-stall that fixes a big cam’s idle problems without going too aggressive.
Hughes brings a proper 2500 RPM stall in a 10.750-inch bolt circle, machined finish, and a 1-year limited warranty. This is a favorite for guys running a cam that won’t idle in gear — the 2500 stall lets the engine sit at a stoplight without stalling or surging. The alloy steel construction is built for repeated abuse, and at 32 pounds it’s a solid, heavy piece.
The owner stories here are telling. One buyer rebuilt his TH350 and found the converter “stalls nicely, power surges at ~2600 RPM,” while another with a cam that previously killed the engine at stoplights reports it “let my motor idle at stop lights (it wouldn’t before because of my cam).” A mild 375-400 hp 350 in a ’72 Chevelle saw an actual brake stall around 2200 RPM — a touch tighter than the 2500 advertised, but pleasing in practice.
The data shows one buyer with an LS (a modern GM engine family) and a Stage 3 cam whose unit didn’t stall until 3200 RPM, making cruising unbearable — likely a misapplication or a bad unit, but note if your combo is far from a mild small block.
The thing everyone raves about: how it cleans up a big cam’s idle while still delivering a noticeable launch surge — best of both worlds for a street/strip car.
Reach for this if: you have a cam that won’t idle in gear and want a converter that fixes that without becoming a track-only monster.
Think twice if: your build is a radical LS with a huge cam — verify your stall expectations first.
6. Allstar Performance ALL26902
A 3200-3500 stall that’s been beaten for years behind a built 454 — if you respect its limits.
This 10-inch powder-coated converter is the high-stall budget bruiser. At 23 pounds it’s lighter than the 12-inch options, and the 3200-3500 RPM stall is aimed directly at the track or a very aggressive street cam. It’s a vehicle-specific fit for the TH350/TH400 family and made in the USA.
The durability story here is legit. One owner has “beat the snot out of one behind a built 454 bbc for last 3 years still going mated to a TCI streetfighter th350.” The same buyer calls it a “super nice convertor just don’t use with a big power adder as it has no anti balloon plate” (a plate that prevents the converter from expanding under high torque) — the key limitation to know about.
That missing anti-balloon plate is the real trade-off. It holds up fine to naturally aspirated torque, but the flexplate can balloon under nitrous or boost without that reinforcement. Another owner thought they were buying a 3500 stall but found 2500 works too, so actual stall can land below the advertised range depending on engine torque.
Our take: unbeatable value for a naturally aspirated high-stall build, with a clear warning attached about staying away from power adders.
Grab this if: you’re building a budget street/strip small block or big block without nitrous and want a serious stall for short money.
Look elsewhere if: you plan to spray it or add boost — you need an anti-balloon plate.
7. B&M 400001 (10″) Turbo Torque Converter
A famous-name 10-inch stall that’s fantastic in the right car and disappointing in the wrong one.
B&M is a legendary name in automatic transmissions, and this 10-inch unit brings a 2700-3000 RPM stall to the table for TH350/TH400 applications. At 23.4 pounds it’s a mid-weight performance converter aimed at a car that spends meaningful time at the track.
The reviews split hard along application lines. A Corvette owner calls it an “excellent torque converter” that “works well” — exactly the kind of lightweight street machine it’s designed for. On the flip side, a big block 402 on a TH400 saw it slip at any RPM, even up to 5000, which points to a mismatch for heavy torque applications.
There’s also a documented stall variance issue: one buyer reports their unit actually stalled at 3600 RPM instead of the 2700-3000 range, which they judged “way too high” and “isn’t streetable.” An occasional unit also arrives looking used at the flywheel bolt feet. The takeaway is to verify stall behavior early, and know this is a street/strip piece, not a tow or heavy-torque converter.
What it is: a solid mid-range stall for a reasonably light, naturally aspirated car — the Corvette crowd loves it, the torque-monster crowd doesn’t.
Best if: you’re running a stock-to-mild small block in a lighter car and want the B&M name with a real stall.
Not for: big blocks making tons of low-end torque, or anyone who can’t tolerate a stall that lands higher than advertised.
8. Assault Racing Products 600000
An affordable 12-inch street stall for budget TH350 builds — with a documented risk in the data.
This is the entry-level option for someone who just needs a working non-lockup converter in the 2200-2600 RPM range. The 12-inch diameter and 10.5-inch bolt circle are the standard TH350 fitment, and the price point is friendly for a budget engine swap or a daily beater that needs a refresh.
The feedback is mixed and honest about what this is. One buyer confirms it “fit in my trans” and looks good. But a lifelong car builder reports this “stall converter might as well be a regular converter. Can’t tell the difference” — suggesting the advertised stall may not materialize in a mild application.
More concerning is a single report of the converter “came apart inside” after about 10 miles of manual shifting from a dead stop. It’s one case, but paired with the “feels like stock” feedback, it tells you this is a gamble on a budget — fine for a low-stress build, risky if you plan to hammer it.
Honest assessment: cheap entry into a TH350 stall converter, but the data shows real variance in stall behavior and one notable durability failure.
Try this if: you have a low-power stock engine and just want to replace a tired converter on a tight budget.
Avoid this if: you expect a real stall improvement or plan any kind of aggressive driving.
Understanding the Specs
Stall Speed (RPM)
Stall speed is the engine RPM where the converter starts transferring power to the transmission. A lower stall (like 1900-2100 RPM) feels stock and stays livable in traffic. A higher stall (2700-3500 RPM) lets the engine build power before the car moves, which is essential for a big cam but makes stop-and-go driving feel loose. Match it to your camshaft’s power band.
Diameter & Bolt Circle
Converters come in 10-inch and 12-inch diameters. A 10-inch unit is lighter and revs higher, while a 12-inch is heavier and multiplies torque better at low RPM. The bolt circle is the pattern that bolts to your flexplate — verify it matches your engine (most TH350 apps are 10.75 inches) or it won’t bolt up.
FAQ
What stall speed should I pick for a mild 350 with a stock cam?
Will a 12-inch converter fit my TH350?
What does the bolt circle measurement mean for my flexplate?
Is a higher stall speed always better for performance?
How long does a remanufactured torque converter last?
What is an anti-balloon plate and do I need one?
Can I use a TH400 converter in my TH350?
Why does my actual stall speed differ from the advertised number?
Final Thoughts: The Verdict
For most people, the turbo 350 torque converter winner is the JEGS 555-60400 because its 2300-2700 RPM stall bridges street comfort and real launch improvement, backed by proven durability on builds up to 500 horsepower. If you want a direct-fit street upgrade on a mostly stock engine, grab the B&M Tork Master 20400. And for a serious high-horsepower build chasing a hard launch, the Allstar ALL26900 is the one to reach for.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of August 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, GoCarLife earns from qualifying purchases. This does not affect which products we feature.