Swapping an automatic or dual-clutch gearbox for a proper manual is one of the most rewarding upgrades a small-block Ford owner can make, and the three kits I’m comparing here all take the same core approach: a Tremec TKX 5-speed paired with a 10.5-inch dual-disc clutch, a steel bellhousing, and the fasteners needed to complete the installation. Where they differ is in the details that determine whether the kit actually bolts into your engine, namely the crankshaft balance weight each package is configured for. My top pick is the TKX 5-Speed Transmission and Clutch Conversion Kit (B0FH7D5FRD), which stands out as the best overall package thanks to its forged internals, ARP fastener package, and the most detailed instructions of the group. For owners of 28-ounce balanced small-blocks, the SBF TKX kit (B0FH7Z8NT1) is the better fit, while the 50-ounce balance version (B0FH7PKT8G) makes the most sense for later 5.0L and 351W builds. All three are heavy, Ford-only, and demand a serious garage commitment — but I’ll walk you through exactly which tradeoffs matter for which build.
Get garage and car supplies delivered free — and shop member deals
- Fast, free delivery on millions of items
- Access to Prime Big Deal Days deals on October 6–7
- Prime Video, Amazon Music and more included
Complete the kit
Key Takeaways
- All three kits are built around the same Tremec TKX 5-speed rated to 600 lb-ft and 7,500+ RPM shifts, so the real decision comes down to crankshaft balance: neutral/zero, 28 oz, or 50 oz.
- The Best Overall pick (B0FH7D5FRD) adds forged shafts and a more complete ARP fastener package, making it the strongest choice for high-output builds and first-time swappers alike.
- Each kit uses a 10.5-inch dual-disc clutch designed for strong holding power with near-stock pedal effort — a meaningful comfort advantage over single-disc race clutches.
- All three packages weigh roughly 203–207 pounds, so a transmission jack and ideally a second set of hands are non-negotiable for installation.
- These kits are strictly for small-block Ford applications; owners of other engines will need a different conversion path entirely.
| TKX 5-Speed Transmission and Clutch Conversion Kit for Small-Block Ford |  | Best Overall | Brand: Speedway Motors | Transmission: Tremec TKX 5-speed manual | Compatibility: Small-block Ford applications | VIEW LATEST PRICE | See Our Full Breakdown |
| Speedway Motors SBF TKX 5-Speed Transmission and Clutch Conversion Kit, 28-Balance |  | Best for 28 oz-Balance Small-Blocks | Brand: Speedway Motors | Transmission: Tremec TKX 5-speed manual | Engine Compatibility: Ford small-block, 28 oz balance | VIEW LATEST PRICE | See Our Full Breakdown |
| Speedway Motors Small-Block Ford TKX 5-Speed Transmission and Clutch Conversion Kit, 50 oz Balance | | Best for Late 5.0L and 351W Builds | Manufacturer: Speedway Motors | Transmission: Tremec TKX 5-speed manual | Engine Compatibility: Small-block Ford, 50 oz balance | VIEW LATEST PRICE | See Our Full Breakdown |
| dual-clutch to manual conversion kit | Transmission | Clutch | Horsepower Support | Brand |
|---|---|---|---|---|
| TKX 5-Speed Transmission and C | Tremec TKX 5-speed manual | 10.5-inch dual-disc | Up to 750 hp | Speedway Motors |
| Speedway Motors SBF TKX 5-Spee | Tremec TKX 5-speed manual | Ram Concept 10.5-inch dual-disc | Up to 750 hp | Speedway Motors |
| Speedway Motors Small-Block Fo | Tremec TKX 5-speed manual | Ram Concept 10.5-inch dual-disc | Up to 750 hp | — |
More Details on Our Top Picks
TKX 5-Speed Transmission and Clutch Conversion Kit for Small-Block Ford
This is the kit I’d point most small-block Ford owners toward first, and the reason comes down to what’s inside the box. Like its siblings, it centers on the Tremec TKX 5-speed with a 600 lb-ft torque rating and the ability to handle shifts at 7,500+ RPM, but this version pairs it with forged shafts, billet hardware, and a full ARP fastener package. Compared with the 28-ounce and 50-ounce balanced kits, that forged-and-billet combination gives me more confidence for builds running serious boost, nitrous, or sustained high-RPM track use.
The 10.5-inch dual-disc clutch is the other headline feature. A dual-disc design splits the clamping load across two friction surfaces, which is how this kit manages strong holding power without the leg-press pedal effort of a comparable single-disc race clutch. For a street-driven car that sees weekend action, that balance matters more than any dyno number. The included high-strength bellhousing and detailed installation instructions round out a package that feels genuinely complete rather than a loose collection of parts.
The tradeoffs are real, though. At 207 pounds, this is the heaviest kit of the three, and it’s the one you’ll want a transmission jack and a helper for. It’s also strictly a small-block Ford solution — if you’re running a different engine family, none of the kits in this lineup apply. And while the dual-disc clutch offers stock-like pedal effort, dual-disc clutches in general can be noisier at idle and less forgiving during low-speed engagement than a stock single-disc, so first-time manual drivers should expect a short learning curve.
Pros:- Complete package with transmission, clutch, bellhousing, fasteners, and instructions included
- Forged shafts and billet hardware add durability for high-output builds
- Dual-disc clutch delivers strong holding power with near-stock pedal effort
- Detailed installation instructions make it more approachable for first-time swappers
Cons:- Limited to small-block Ford applications with neutral balance
- Heaviest kit of the three at 207 pounds
- Dual-disc clutches can be noisier and trickier to modulate at low speed than stock units
Best for: Small-block Ford owners running neutral/zero-balance cranks who want the most complete, strongest package for high-horsepower builds
Not ideal for: Owners of non-Ford engines, or anyone without the lifting equipment and workspace to handle a 207-pound kit
- Brand:Speedway Motors
- Transmission:Tremec TKX 5-speed manual
- Compatibility:Small-block Ford applications
- Torque Capacity:Up to 600 lb-ft
- Maximum Shift RPM:7,500+ RPM
- Clutch:10.5-inch dual-disc
- Horsepower Support:Up to 750 hp
- Item Weight:207 pounds
- Model Number:91029056-0
Our verdict“The most complete and robust package in this lineup, and my default recommendation for anyone whose crank balance matches it.”
Speedway Motors SBF TKX 5-Speed Transmission and Clutch Conversion Kit, 28-Balance
If your small-block Ford runs a 28-ounce externally balanced crank — common on many 302 and 351W builds — this is the kit that matches your engine, and no amount of features on the other two options changes that. Ordering a mismatched balance weight is the single most expensive mistake you can make in this category, so I treat compatibility as the first filter and everything else as secondary. Once that filter is applied, this kit holds its own well against my top pick: it carries the same 600 lb-ft and 750 hp ratings, the same 7,500+ RPM shift capability, and a Ram Concept 10.5-inch dual-disc clutch chosen specifically for smooth engagement.
Where it differs from the Best Overall kit is in the details rather than the fundamentals. The clutch is a named Ram unit rather than the generic dual-disc description on the flagship kit, which gives some builders extra confidence in friction material quality. On the other hand, the product information doesn’t highlight the forged-shaft construction of the B0FH7D5FRD kit, so anyone building an 800-horsepower monster might lean toward the flagship for its documented internals. For a street or street/strip car in the 500–700 hp range, that distinction is largely academic.
The steel bellhousing is a sensible choice here — steel is more forgiving of abuse and easier to inspect than some lighter alternatives, at the cost of a few pounds. And pounds are the recurring theme: at 203 pounds, installation is still a two-person or serious-jack job. My other caution is that compatibility extends only to specified small-block Ford applications, so verifying your exact engine and balance before ordering is the homework that saves the return shipping.
Pros:- Correctly configured for 28-ounce externally balanced small-block Ford cranks
- Ram Concept dual-disc clutch is designed for strong holding power and smooth engagement
- Same 600 lb-ft / 750 hp / 7,500+ RPM capability as the rest of the lineup
- Includes steel bellhousing, fasteners, hardware, and installation instructions
Cons:- Only fits specified Ford small-block applications with 28-ounce balance
- Doesn’t advertise the forged-shaft internals of the flagship kit
- 203-pound weight makes handling and installation physically demanding
Best for: Owners of 28-ounce externally balanced small-block Fords who want a complete TKX conversion with a name-brand Ram clutch
Not ideal for: Zero-balance or 50-ounce crank builds, or anyone needing documented forged internals for extreme power levels
- Brand:Speedway Motors
- Transmission:Tremec TKX 5-speed manual
- Engine Compatibility:Ford small-block, 28 oz balance
- Clutch:Ram Concept 10.5-inch dual-disc
- Torque Capacity:Up to 600 lb-ft
- Shift Capability:7,500+ RPM
- Horsepower Support:Up to 750 hp
- Bellhousing:Steel
- Item Weight:203 pounds
Our verdict“The right choice isn’t the best-on-paper choice — it’s the one matching your crank, and for 28-ounce builds this kit delivers flagship-level performance without compromise.”
Speedway Motors Small-Block Ford TKX 5-Speed Transmission and Clutch Conversion Kit, 50 oz Balance
The 50-ounce balance version exists for a very specific and very common crowd: late-model 5.0L HO and 351W small-blocks, which use the heaviest external crank balance of the Ford small-block family. If that’s your engine, this kit spares you the hassle of rebalancing a rotating assembly or tracking down a separately balanced flywheel and clutch — everything arrives matched to your crank. That convenience is the entire pitch, and it’s a compelling one for anyone who has ever tried to source balance-correct rotating components individually.
Feature-wise, this kit actually splits the difference between its two siblings nicely. It includes the ARP fastener package that the 28-ounce kit doesn’t highlight, bringing it closer to the flagship’s hardware quality, and it carries the same Ram Concept 10.5-inch dual-disc clutch as the 28-ounce version, with engagement described as smooth and pedal effort close to stock. Compared with the Best Overall pick, you give up the documented forged shafts and pick up a dedicated 50-ounce balance configuration — a trade most street builders will happily make, since a kit that doesn’t match your crank is worthless regardless of its internals.
Its limitations mirror the rest of the lineup. The 203-pound shipping weight demands proper lifting equipment, the application range stops at small-block Ford, and the dual-disc clutch will still teach your left foot new habits in parking lots. What I appreciate about this kit is that it doesn’t cut corners to hit its niche — the steel bellhousing, ARP hardware, and full instruction set are all there, so late-model owners aren’t settling for a lesser product just because of their crank balance.
Pros:- Purpose-matched to 50-ounce externally balanced small-block Ford cranks
- ARP fastener package brings hardware quality close to the flagship kit
- Ram dual-disc clutch balances holding power with stock-like pedal effort
- Complete package with transmission, clutch, steel bellhousing, and instructions
Cons:- Only fits small-block Ford applications with 50-ounce balance
- No mention of the forged shafts offered on the Best Overall kit
- Heavy 203-pound package complicates shipping, handling, and installation
Best for: Owners of 50-ounce balanced engines, especially late 5.0L and 351W builds, who want a matched complete kit with ARP hardware
Not ideal for: Neutral or 28-ounce balance engines, and builders who need the forged internals documented on the flagship kit
- Manufacturer:Speedway Motors
- Transmission:Tremec TKX 5-speed manual
- Engine Compatibility:Small-block Ford, 50 oz balance
- Clutch:Ram Concept 10.5-inch dual-disc
- Maximum Torque:600 lb-ft
- Maximum Shift Speed:7,500+ RPM
- Horsepower Support:Up to 750 hp
- Bellhousing:Steel
- Hardware:ARP fasteners
Our verdict“For late 5.0L and 351W owners, this matched-balance kit with ARP hardware is the smart, complete path to a TKX five-speed.”
How We Picked
Because every kit in this comparison shares the same TKX transmission platform and near-identical torque ratings, I focused on the factors that actually separate one purchase from another. First, I looked at engine compatibility and balance configuration, since ordering the wrong balance weight means a clutch that vibrates, wears prematurely, or simply won’t sit correctly on the crank. Second, I compared the completeness of each package — which bellhousing, clutch brand, hardware, and instructions are included, because piecing together missing components separately drives up both cost and installation time. Third, I weighed build quality indicators like forged shafts, billet hardware, and ARP fasteners, which matter most for anyone pushing their engine toward the upper end of the 750 hp ceiling. Finally, I considered the practical realities of installation, including the roughly 200-pound shipping weight of each kit and the level of documentation provided. I did not factor in pricing or popularity metrics — my goal is to match each kit to the right engine and the right builder, not to rank by sales.
| dual-clutch to manual conversion kit | Engine Compatibility |
|---|---|
| TKX 5-Speed Transmission and C | — |
| Speedway Motors SBF TKX 5-Spee | Ford small-block, 28 oz balance |
| Speedway Motors Small-Block Fo | Small-block Ford, 50 oz balance |
Factors to Consider When Choosing Best Dual-clutch To Manual Conversion Kits
Choosing between these three kits comes down to a handful of decisions that apply to any dual-clutch or automatic-to-manual conversion on a small-block Ford. Before ordering anything, I’d work through the following points.Match Your Crankshaft Balance First
The single most important specification in this comparison is the external balance weight the kit is configured for: neutral/zero, 28 oz, or 50 oz. Early small-blocks and internally balanced strokers typically use a neutral setup, many 302 and 351W builds use 28 oz, and late-model 5.0L engines commonly use 50 oz. Installing a clutch and flywheel with the wrong balance causes driveline vibration, accelerated bearing wear, and potential crank damage. Check your engine’s specifications or consult your machinist before buying — this is the one mistake no feature list can rescue you from.
Understand the Dual-Disc Clutch Tradeoff
All three kits use a 10.5-inch dual-disc clutch because it solves a specific problem: holding 600 lb-ft of torque without requiring race-grade pedal pressure. The second friction disc spreads the load, which is why these kits advertise stock-like pedal effort alongside serious holding power. The tradeoff is that dual-disc clutches often exhibit chatter or rattle at idle (sometimes called “marbles in the transmission”) and demand more precise clutch modulation in stop-and-go driving. For a performance street car, most owners consider that a fair exchange; for a daily commuter, it’s worth honest reflection.
Power Ratings and Real-World Headroom
Every kit here is rated for 600 lb-ft of torque, 750 hp, and 7,500+ RPM shifts, which comfortably covers most naturally aspirated and moderate boost builds. If your engine lives near or above that ceiling, the flagship kit’s forged shafts become the deciding factor, since documented internals give you margin the other kits don’t explicitly advertise. It’s also wise to leave headroom rather than running any component at its rated maximum continuously.
Plan for the Physical Installation
All three packages weigh 203–207 pounds, and that’s before you factor in crossmember modifications, driveshaft length changes, shifter boot and tunnel clearances, clutch hydraulics or linkage, and fluid fill. A transmission jack is mandatory, a hoist or tall jack stands make the job far safer, and a second person turns a miserable day into a manageable one. Budget time for the supporting parts none of these kits include — driveshaft work alone can be a shop visit.
Confirm Complete Vehicle Compatibility
These kits cover the engine side of the conversion, but a complete swap also involves the transmission crossmember, driveshaft yoke and length, shifter location, speedometer or sensor integration, and clutch actuation. Before ordering, verify your vehicle’s tunnel clearance for the TKX and confirm which supporting components you’ll source separately. The included installation instructions are a genuine asset here — read them before the parts arrive, not after.
Frequently Asked Questions
What’s the actual difference between these three TKX conversion kits?
The core hardware is nearly identical — all three pair the Tremec TKX 5-speed with a 10.5-inch dual-disc clutch, a steel bellhousing, and installation instructions rated at 600 lb-ft and 750 hp. The primary difference is the crankshaft balance configuration: the Best Overall kit (B0FH7D5FRD) is set up for neutral/zero-balance applications, while the other two are matched to 28-ounce and 50-ounce externally balanced cranks respectively. There are secondary differences too — the flagship kit documents forged shafts and billet hardware, and the two balanced kits use a named Ram Concept clutch — but balance is the specification that determines which kit can physically and safely bolt to your engine.
How do I know which balance weight my small-block Ford needs?
The balance weight corresponds to your crankshaft’s external counterweighting. Many early 289/302 blocks and internally balanced stroker assemblies run neutral balance, a large share of 302 and 351W builds run 28-ounce balance, and most late-model 5.0L HO engines run 50-ounce balance. If your engine is stock, the factory specifications for your year and displacement will tell you; if it’s been rebuilt or stroked, the machine shop’s balance sheet is the authority. When in doubt, pull the flywheel and check for balance weights or consult a machinist — guessing here leads to vibration and crank bearing damage that costs far more than an afternoon of verification.
Is a dual-disc clutch worth it for a street car?
For a high-torque street build, I’d say yes, and these kits explain why. A single-disc clutch capable of holding 600 lb-ft typically demands very heavy spring pressure, which turns every traffic jam into a leg workout and can strain clutch hydraulics or linkage. A dual-disc spreads the load across two friction surfaces, delivering comparable holding power with close to stock pedal effort. The costs are noise — dual-discs often rattle or chatter at idle with the clutch disengaged — and a grabbier, less linear engagement that takes practice in parking-lot maneuvers. For a performance car that’s driven regularly but not-commuted-in, the tradeoff is favorable.
Can I install one of these kits by myself in a home garage?
It’s possible, but I’d call it a two-person job more often than not. Each kit weighs roughly 203–207 pounds, and maneuvering a TKX up to the bellhousing while lying on your back demands a transmission jack at minimum, with a hoist or tall stands strongly recommended for access and safety. Beyond the physical lifting, the swap typically involves crossmember modifications, driveshaft length verification, shifter tunnel clearance, and clutch actuation setup — the included instructions help, but expect a weekend or two rather than an afternoon. If you’ve never done a transmission swap, enlisting an experienced friend or a shop for the final alignment saves real frustration.
Will these kits handle a heavily modified or forced-induction engine?
All three are rated to 600 lb-ft and 750 hp with 7,500+ RPM shift capability, which covers most naturally aspirated small-blocks and moderate boost builds with room to spare. If your combination is genuinely at or above those numbers, the Best Overall kit’s forged shafts make it the safest choice in this lineup, since documented internals provide margin the 28-ounce and 50-ounce kits don’t explicitly advertise. That said, running any component continuously at its rated ceiling shortens its life — if your engine makes more than 550–600 lb-ft on a regular basis, it’s worth a conversation with the manufacturer about your specific use case before committing.
Conclusion
Because all three kits share the same Tremec TKX platform and identical power ratings, my final recommendations come down to your engine and your build ambitions. If you’re running a neutral/zero-balance small-block and want the most robust package — forged shafts, billet hardware, full ARP fasteners, and the best documentation — the TKX Conversion Kit (B0FH7D5FRD) is my Best Overall pick and the one I’d order for any serious performance build. Owners of 28-ounce balanced 302 and 351W engines should go straight to the SBF TKX 28-Balance kit (B0FH7Z8NT1), which matches the flagship’s capability with a name-brand Ram clutch. If you have a late-model 5.0L or 351W with a 50-ounce crank, the 50 oz Balance kit (B0FH7PKT8G) gives you a factory-matched conversion with ARP hardware and no rotating-assembly guesswork. Whichever route you take, verify your crank balance before ordering, invest in a transmission jack, and read the instructions twice — your left foot will thank you at the first stoplight.
Halloween Picks
halloween
As an affiliate, we earn on qualifying purchases.
