These three kits pair a Tremec TKX five-speed with a Ram dual-disc clutch and supporting conversion hardware for small-block Ford builds. My overall pick is the 50 oz balance kit for buyers whose engine requires that balance configuration; the 28-balance version serves the corresponding 28 oz application, while the unqualified small-block Ford kit is a useful option when its stated fitment details match the build. All three claim capacity up to 600 lb-ft and support shifts above 7,500 rpm, so the main choice is less about advertised strength and more about engine balance, application fit, package details, and handling a kit weighing about 203 to 207 pounds.
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These are manual conversion kits, not dual-clutch transmissions: “dual-disc” describes the clutch assembly. I would verify the engine’s balance specification, bellhousing and chassis fit, and the exact parts included before ordering. The listings describe similar performance capabilities, but small differences in stated hardware and weight do not establish a meaningful advantage without confirming the exact configuration.
Complete the kit
Key Takeaways
- The 50 oz kit is the match to investigate for compatible small-block Ford engines that require 50 oz balance; its listed model is 91029056-50.
- The 28-balance kit is intended for compatible 28 oz Ford small-block applications, and its distinct balance specification is the deciding factor over the 50 oz version.
- All three listings describe a Tremec TKX five-speed, a 10.5-inch Ram dual-disc clutch, and claimed capacity up to 600 lb-ft and 750 hp.
- The third listing identifies forged shafts, billet hardware, ARP fasteners, and installation instructions, but its 207-pound listed weight is the highest of the three.
- These packages are aimed at small-block Ford swaps; none is presented as a universal kit, so confirm engine, chassis, balance, and installation requirements before choosing.
| Speedway Motors Small-Block Ford TKX 5-Speed Transmission and Clutch Conversion Kit, 50 oz Balance |  | Best Overall for 50 oz balance applications | Transmission: Tremec TKX five-speed manual | Engine compatibility: Small-block Ford | Balance: 50 oz | VIEW LATEST PRICE | See Our Full Breakdown |
| Speedway Motors SBF TKX 5-Speed Transmission and Clutch Conversion Kit, 28-Balance | | Best Match for 28 oz Balance Builds | Transmission: Tremec TKX five-speed manual | Engine compatibility: Ford small-block | Balance: 28 oz | VIEW LATEST PRICE | See Our Full Breakdown |
| TKX 5-Speed Transmission and Clutch Conversion Kit for Small-Block Ford |  | Best for Buyers Seeking More Construction Detail | Transmission: Tremec TKX five-speed manual | Compatibility: Small-block Ford applications | Clutch: 10.5-inch dual-disc | VIEW LATEST PRICE | See Our Full Breakdown |
| dual-clutch to manual conversion kit | Transmission | Clutch | Horsepower support | Engine compatibility |
|---|---|---|---|---|
| Speedway Motors Small-Block Fo | Tremec TKX five-speed manual | Ram Concept 10.5-inch dual-disc | Up to 750 hp | Small-block Ford |
| Speedway Motors SBF TKX 5-Spee | Tremec TKX five-speed manual | Ram Concept 10.5-inch dual-disc | Up to 750 hp | Ford small-block |
| TKX 5-Speed Transmission and C | Tremec TKX five-speed manual | 10.5-inch dual-disc | Up to 750 hp | — |
More Details on Our Top Picks
Speedway Motors Small-Block Ford TKX 5-Speed Transmission and Clutch Conversion Kit, 50 oz Balance
This is my leading pick for a compatible small-block Ford build that calls for 50 oz balance. The distinguishing detail is explicit in the product name and model number, so it gives a buyer a clearer starting point than the third listing, which does not state a balance figure in the supplied information. The package includes a Tremec TKX five-speed, Ram dual-disc clutch, steel bellhousing, and ARP hardware, covering major conversion components in one listing.
Its stated ceiling of 600 lb-ft and 750 hp, along with 7,500-plus-rpm shift capability, puts it in the same advertised performance class as the 28-balance kit. I would not choose between those two based on strength claims; I would choose by the engine’s balance requirement. The dual-disc clutch is described as aiming for strong holding power with smooth engagement and stock-like pedal effort, a useful combination for a street-oriented performance build, though actual pedal feel depends on the complete installation.
The main drawback is narrow application fit: the 50 oz specification must match the engine and the rest of the swap. At a listed 203 pounds, the package also calls for suitable lifting and installation planning. Compared with the 28-balance version, it offers no stated capacity advantage; its value is the clearly specified balance. Buyers should confirm included small parts, chassis clearance, and any separate items required for installation.
Pros:- Clearly identified 50 oz balance configuration
- Includes TKX transmission, dual-disc clutch, steel bellhousing, and ARP hardware
- Claims capacity up to 600 lb-ft and 750 hp
- Clutch is described as combining holding power with stock-like pedal effort
Cons:- Fit is limited to compatible small-block Ford applications with the correct balance requirement
- Listed at 203 pounds, making handling and installation more involved
Best for: Small-block Ford builders who have confirmed they need a 50 oz balance conversion and want the TKX, clutch, bellhousing, and major hardware together.
Not ideal for: Owners with 28 oz balance engines, non-Ford applications, or swaps that need a universal package without additional fitment checks.
- Transmission:Tremec TKX five-speed manual
- Engine compatibility:Small-block Ford
- Balance:50 oz
- Clutch:Ram Concept 10.5-inch dual-disc
- Maximum torque:600 lb-ft
- Horsepower support:Up to 750 hp
- Bellhousing and hardware:Steel bellhousing; ARP fasteners
- Listed weight:203 pounds
- Model number:91029056-50
Our verdict“For a compatible 50 oz small-block Ford build, this is the most clearly specified all-in-one choice, though it shares its performance claims with the 28-balance kit.”
Speedway Motors SBF TKX 5-Speed Transmission and Clutch Conversion Kit, 28-Balance
For an engine that calls for 28 oz balance, this is the straightforward counterpart to the 50 oz kit. The balance figure is the reason to select it; the supplied specifications otherwise put it on similar footing, with a TKX five-speed, 10.5-inch Ram dual-disc clutch, steel bellhousing, hardware, and installation instructions. Its 600 lb-ft, 750 hp, and 7,500-plus-rpm claims match the other Speedway Motors options described here.
That parity makes the application label more useful than a broad performance comparison. Against the 50 oz version, this kit does not present a higher capacity or an extra named drivetrain component. It is the right candidate only when the engine’s balance requirement calls for 28 oz. If the engine’s balance is uncertain, I would pause and verify it rather than assume the two kits can be substituted based on their similar names.
The package is listed at 203 pounds, so receiving and positioning it deserves planning. Its stated compatibility is limited to specified Ford small-block applications, and the supplied details do not resolve every chassis or ancillary fitment question. Compared with the third kit, it has a clearly stated balance configuration and lower listed weight; the third description provides more named construction details. Buyers who value a well-defined balance choice should favor this one, while those looking for extra information about shafts and hardware should compare the other listing and confirm exactly what is included.
Pros:- Explicit 28-balance designation helps distinguish it from the similar 50 oz package
- Includes the TKX, dual-disc clutch, steel bellhousing, fasteners, and instructions
- Shares the lineup’s claimed 600 lb-ft and 750 hp capacity
- Dual-disc clutch is described as providing strong holding power and smooth engagement
Cons:- Only suits compatible Ford small-block applications requiring 28 oz balance
- At 203 pounds, the kit is substantial to handle during installation
Best for: Builders with a compatible Ford small-block engine confirmed to require 28 oz balance who want the TKX and clutch components in one package.
Not ideal for: 50 oz balance engines, other engine families, or buyers expecting a transmission kit to eliminate vehicle-specific fitment work.
- Transmission:Tremec TKX five-speed manual
- Engine compatibility:Ford small-block
- Balance:28 oz
- Clutch:Ram Concept 10.5-inch dual-disc
- Torque capacity:Up to 600 lb-ft
- Horsepower support:Up to 750 hp
- Shift capability:7,500+ rpm
- Bellhousing:Steel
- Manufacturer part number:91029056-28
Our verdict“Choose this over the 50 oz kit when the engine requires 28 oz balance; the listed performance capabilities are otherwise closely matched.”
TKX 5-Speed Transmission and Clutch Conversion Kit for Small-Block Ford
This listing stands out by naming forged shafts, billet hardware, ARP fasteners, and installation instructions alongside its TKX and dual-disc clutch. That added description may help a buyer compare package contents with a build plan. Its stated performance envelope—up to 600 lb-ft, 750 hp, and shifts above 7,500 rpm—tracks the two balance-specific kits, so the product description does not establish a higher capacity advantage.
Its key limitation is fitment clarity. The supplied details say small-block Ford but do not specify 28 oz or 50 oz balance. The other two products make that distinction directly, which makes them easier to match when balance is already known. I would treat this third option as a candidate to investigate, not assume it covers both configurations. Ask the seller to confirm the included balance-related components and verify the full parts list against the engine and vehicle.
The listed weight is 207 pounds, four pounds more than the other two entries, though that difference alone does not tell me anything about strength or ease of installation. Compared with the 28-balance kit, this one gives more named construction detail but less explicit balance information. It may suit a buyer who values those construction claims and can get fitment confirmed; anyone prioritizing a clearly identified balance package has a simpler choice in the first or second pick.
Pros:- Description names forged shafts and billet hardware
- Includes ARP fasteners and installation instructions
- Claims capacity up to 600 lb-ft and 750 hp
- Dual-disc clutch is described as balancing holding power with stock-like pedal effort
Cons:- Supplied specifications do not identify a 28 oz or 50 oz balance configuration
- Listed weight of 207 pounds is the highest in this comparison
Best for: Small-block Ford builders who want the described forged-shaft and billet-hardware details and can confirm the kit’s balance configuration before purchase.
Not ideal for: Buyers who need an explicitly identified 28 oz or 50 oz kit, or those seeking a universal conversion package.
- Transmission:Tremec TKX five-speed manual
- Compatibility:Small-block Ford applications
- Clutch:10.5-inch dual-disc
- Torque capacity:Up to 600 lb-ft
- Horsepower support:Up to 750 hp
- Maximum shift speed:7,500+ rpm
- Named construction details:Forged shafts, billet hardware, ARP fasteners
- Listed weight:207 pounds
- Model number:91029056-0
Our verdict“Consider this package for its more detailed construction description, but confirm balance fitment because the other two listings state it more clearly.”
How We Picked
I ranked these options around the decisions that matter for a small-block Ford manual conversion: balance compatibility, the main drivetrain components, stated performance capacity, and clarity of the package description. A flywheel balance mismatch can make an otherwise capable kit unsuitable, so the two explicitly identified balance versions receive distinct roles rather than being treated as interchangeable. I placed the 50 oz kit first as the clearest match for that application, and the 28-balance kit next for builds requiring its specification.
The third kit remains a credible candidate because its description calls out forged shafts, billet hardware, ARP fasteners, and installation instructions. Its listing, however, does not identify a 28 or 50 oz balance in the supplied details, so I would ask the seller to verify that point before treating it as a fit. It is also listed at 207 pounds, compared with 203 pounds for the other packages. I do not infer that the extra weight means stronger or better parts.
All three share similar headline capacity claims and dual-disc clutch positioning. Those figures help establish the intended performance range, but they do not prove that every engine, chassis, bellhousing, or driving style is covered. I treat the claimed horsepower and torque as listing specifications, not independent test results. My ordering favors application specificity and decision usefulness, while calling out where the supplied descriptions leave fitment questions open.
| dual-clutch to manual conversion kit | Engine compatibility |
|---|---|
| Speedway Motors Small-Block Fo | Small-block Ford |
| Speedway Motors SBF TKX 5-Spee | Ford small-block |
| TKX 5-Speed Transmission and C | — |
Factors to Consider When Choosing Best Dual-clutch To Manual Conversion Kits
My first decision point is whether one of these small-block Ford packages fits the engine and vehicle. The shared TKX and clutch specifications make balance, installation requirements, and the exact included components the most useful ways to separate them.Confirm engine balance before comparing packages
The 50 oz and 28 oz labels distinguish the first two kits. Those are application details, not trim levels: choosing the wrong one can make the package unsuitable for the engine. I would confirm the engine’s balance specification from reliable build records or a qualified parts specialist, then match it to the listing. If that information is missing, resolve it before ordering. The third listing does not name either balance configuration in the supplied specs, so ask directly which version it includes.
Do not infer that “small-block Ford” alone settles fitment. Engine year, rotating assembly, flywheel or clutch arrangement, bellhousing, and the vehicle’s existing components can all affect a conversion. These listings identify a kit category, but they do not supply every possible application detail for every chassis. Compare the exact vehicle and engine setup with the seller’s compatibility information.
Treat the performance figures as application limits to verify
Each product claims support for up to 600 lb-ft and 750 hp, with 7,500-plus-rpm shift capability. These shared figures suggest the packages target performance builds, but they should not be read as guarantees for every combination of engine output, vehicle weight, tire grip, launch style, or sustained use. I would compare the intended use and actual torque output with the manufacturer’s application guidance.
Because the headline numbers are alike, they do not provide a sound reason to rank the 28 oz kit above the 50 oz one, or vice versa. For those two, balance fitment is the practical distinction. The third listing adds construction terms such as forged shafts and billet hardware, but the supplied information does not establish how those details change capacity relative to its siblings.
Check what the conversion package includes
The descriptions list a Tremec TKX five-speed, Ram dual-disc clutch, steel or high-strength bellhousing, and hardware. The 50 oz entry calls out ARP fasteners; the 28-balance entry says it includes fasteners and installation instructions; the third names forged shafts, billet hardware, ARP fasteners, and instructions. Those distinctions are useful when preparing a parts list, but verify the precise contents for the exact model number you intend to buy.
A conversion can require additional vehicle-specific parts or work, and these listings do not establish that every item needed for every swap is in the box. Ask about items such as the appropriate flywheel, release mechanism, crossmember, driveshaft changes, shifter location, hydraulic or mechanical clutch actuation, and any wiring or interior changes your vehicle may need. The answer depends on the car and existing drivetrain.
Plan for weight and installation access
These packages are listed at 203 pounds for the balance-specific options and 207 pounds for the third. Those are substantial assemblies to receive, move, and position under a vehicle. Arrange suitable lifting equipment, stable support, and enough workspace before the installation begins. The weight difference between listings is small and should not be treated as evidence that one is stronger or easier to install.
Transmission swaps also involve alignment, clearance, and linkage details that depend on the vehicle. If this is your first manual conversion, compare the supplied instructions with the work your chassis requires and identify any tasks that call for a shop or experienced installer. The included hardware may simplify parts gathering, but it does not make every vehicle installation identical.
Choose based on the build, not the product title alone
For an engine confirmed at 50 oz balance, start with the first kit; for a compatible 28 oz engine, start with the second. Consider the third if its stated forged-shaft and billet-hardware details suit your priorities, but get a direct answer on balance and fitment. If the supplier cannot confirm the configuration against your engine and car, I would not rely on the general small-block Ford label as a substitute.
Finally, make sure a manual conversion matches how you intend to drive the vehicle. A dual-disc clutch is designed to hold more than a basic clutch arrangement while retaining manageable pedal effort according to the descriptions, but clutch feel and engagement depend on setup and use. Buyers seeking an automatic or dual-clutch transmission should look elsewhere: these are kits for converting to a conventional manual transmission with a dual-disc clutch.
Frequently Asked Questions
Are these dual-clutch transmission conversion kits?
No. Each package is described as a conversion to a conventional Tremec TKX five-speed manual. “Dual-disc” refers to the clutch assembly, not a dual-clutch transmission with automated gear changes. These kits suit buyers who want a manual gearbox and clutch pedal arrangement, subject to vehicle fitment.
How do I choose between the 50 oz and 28 oz kits?
Match the kit to the balance specification required by your compatible small-block Ford engine. The first listing identifies 50 oz balance, and the second identifies 28 oz. They share similar stated performance capacity, so do not select by horsepower claims alone. If you cannot confirm the engine’s balance, ask a qualified parts specialist or the seller before ordering.
Does the third kit fit both balance configurations?
The supplied description identifies small-block Ford compatibility but does not specify either 28 oz or 50 oz balance. I would not assume it covers both. Ask the seller to confirm the exact configuration and included balance-related components for model 91029056-0, then compare the answer with the engine and vehicle setup.
Are all the parts needed for every swap included?
The listings describe major drivetrain components and hardware, including a TKX transmission, dual-disc clutch, and bellhousing. They do not establish that every vehicle-specific item or modification is included for every application. Verify the detailed parts list and ask about fitment needs such as the release system, crossmember, driveshaft, shifter position, and any other parts required by your chassis.
What do the 600 lb-ft and 750 hp claims mean for my build?
Those are the listings’ stated performance limits, shared across the three options. They help describe the intended range, but they are not independent test results or a guarantee for every combination of vehicle, use, and installation. Compare your engine’s output and intended driving with the manufacturer’s guidance, and remember that the balance configuration and mechanical fit still need to match.
Conclusion
My recommendation depends on the engine first: choose the 50 oz kit for a confirmed compatible 50 oz application, or the 28-balance kit when the engine requires 28 oz. Both provide the clearest balance-specific descriptions and share the same stated performance class. For buyers drawn to the third listing’s forged shafts and billet hardware, I would get balance and exact fitment confirmed before selecting it. Across all three, plan for a heavy installation and verify the vehicle-specific parts list; the product descriptions do not make every swap identical.
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