Description
TCI Circlematic 742020P1: Overview
The TCI Circlematic Transmissions 742020P1 belongs to TCI Auto’s Circlematic line of specialized automatic transmissions. It is a remanufactured automatic transmission with two gears and a configuration intended for performance-oriented applications rather than a conventional street transmission.
TCI identifies its Circlematic transmission line as suitable for oval track use. The supplied product information also states that these transmissions can be used for performance marine applications, giving the product line applications beyond traditional automotive racing.
The 742020P1 uses a Chevy bellhousing bolt pattern and an OEM-style aluminum transmission case with a natural finish. Its 11.250-inch tailshaft, slip-on yoke, and 17-spline input provide important dimensional and drivetrain characteristics for buyers evaluating the transmission for a specific application.
The transmission uses a full-manual valve body and reverse shift pattern. It has two gears and a 1.82 first gear ratio. The product is also described as a clutchless-style, low-gear-only transmission, making its configuration particularly important when matching it to a performance drivetrain.
The transmission includes a torque converter, transmission fluid, and dipstick. It is sold individually. However, the package does not include a flexplate, transmission controller, wiring harness, transmission cooler, or trans-brake.
These details make the 742020P1 a product that should be evaluated according to the complete drivetrain rather than simply selected as a general replacement automatic transmission.
Applications and Compatibility
The TCI Circlematic 742020P1 is designed around a specialized two-speed configuration. TCI’s supplied product information identifies oval track applications as a primary use for Circlematic transmissions and also notes their suitability for performance marine applications.
The Chevy bellhousing bolt pattern is an important compatibility characteristic. Buyers should consider this specification alongside the transmission’s input spline count, tailshaft length, yoke style, shift configuration, and other drivetrain requirements.
The 742020P1 has a 17-spline input and an 11.250-inch tailshaft. Its output uses a slip-on yoke style. These specifications are particularly useful when evaluating whether the transmission’s physical and drivetrain interfaces correspond with the intended build.
The transmission’s full-manual valve body also distinguishes it from many conventional automatic transmissions. Its reverse shift pattern and low-gear-only configuration should be considered when determining whether the transmission matches the operating requirements of the vehicle or marine application.
The product is not lockup compatible and does not include a transmission controller or wiring harness. This is relevant for buyers planning a complete transmission system and determining which additional components may be required for their particular application.
Because Circlematic transmissions are specialized performance products, compatibility should be evaluated using the complete set of available specifications rather than relying only on the Chevy bellhousing pattern.
For buyers comparing options, the automatic transmissions category can provide access to other transmission configurations that may better match different drivetrain requirements.
Performance-Focused Construction
The TCI Circlematic Transmissions 742020P1 uses an aluminum transmission case with an OEM-style case design and natural finish. The transmission pan is also made from aluminum.
The Circlematic product line features high-performance clutches, a steel clutch hub, and a modified planetary gear set. According to the supplied product information, the modified planetary gear set is designed to work with the latest rear suspensions.
The steel clutch hub is an important part of the transmission’s specified construction. Combined with the high-performance clutch design identified for the Circlematic line, it reflects the product’s intended use in specialized performance combinations.
The transmission is remanufactured, rather than new. This condition should be considered when comparing the 742020P1 with other transmission options.
The product also has an advertised flash stall rating of direct drive. No numerical RPM stall rating is provided in the supplied specifications, so a specific stall-speed figure should not be assumed.
The 742020P1 does not have a built-in transmission shield or flexplate shield. It also does not include a trans-brake. These characteristics are important for buyers evaluating the transmission as part of a complete performance setup.
Why Choose the TCI Circlematic 742020P1?
The TCI Circlematic 742020P1 offers a specialized combination of features intended for performance-oriented applications.
Its two-speed design and 1.82 first gear ratio provide a distinct transmission configuration compared with conventional multi-speed automatic transmissions. The full-manual valve body and reverse shift pattern further define how this transmission is configured for its intended application.
The transmission also incorporates a steel clutch hub and the Circlematic line’s high-performance clutch design. Its modified planetary gear set is another notable feature identified by TCI for the Circlematic range.
For buyers working with a Chevy-based drivetrain, the Chevy bellhousing pattern provides an important starting point when assessing compatibility. However, the 17-spline input, 11.250-inch tailshaft, slip-on yoke, and other specifications should also be checked against the complete drivetrain.
Another practical consideration is what comes with the transmission. The 742020P1 includes a torque converter, transmission fluid, and dipstick. At the same time, buyers should note that the flexplate, controller, wiring harness, transmission cooler, and trans-brake are not included.
This makes the product particularly relevant to experienced buyers, racing teams, performance builders, and marine applications where a specialized two-speed transmission configuration is appropriate.
Who Is the 742020P1 Designed For?
The TCI Circlematic 742020P1 is designed for buyers seeking a specialized automatic transmission for performance applications.
Its primary intended audience includes oval track racers and builders working with performance-oriented drivetrain combinations. TCI also identifies the Circlematic product line for performance marine applications.
Professional drivetrain builders may find the detailed specifications useful when evaluating the transmission as part of a larger vehicle or marine powertrain. The full-manual valve body, low-gear-only configuration, Chevy bellhousing pattern, 17-spline input, and 11.250-inch tailshaft are all important considerations.
The product is not positioned as a conventional street automatic transmission. Its two-speed design, non-lockup configuration, and lack of an included transmission controller or wiring harness make it better suited to applications specifically designed around these characteristics.
Buyers who need a different automatic transmission configuration can explore related performance transmissions and other transmission products to identify an option that matches their drivetrain requirements.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | TCI Auto |
| Manufacturer’s Part Number | 742020P1 |
| Product Line | TCI Circlematic Transmissions |
| Part Type | Automatic Transmissions |
| Summit Racing Part Number | TCI-742020P1 |
| UPC | 788120046527 |
| Condition | Remanufactured |
| Number of Gears | 2 |
| Bellhousing Bolt Pattern | Chevy |
| Transmission Shift Pattern | Reverse |
| Valve Body Style | Full manual |
| First Gear Ratio | 1.82 |
| Torque Converter | Included |
| Flexplate | Not included |
| Transmission Controller | Not included |
| Wiring Harness | Not included |
| Transmission Cooler | Not included |
| Advertised Flash Stall Rating | Direct drive |
| Trans-Brake | Not included |
| Lockup Compatible | No |
| Transmission Pan Material | Aluminum |
| Tailshaft Length | 11.250 in. |
| Yoke Style | Slip-on |
| Input Spline Quantity | 17 |
| Clutch Hub | Steel |
| Transmission Case Style | OEM |
| Transmission Case Material | Aluminum |
| Transmission Case Finish | Natural |
| Transmission Shield Built In | No |
| Flexplate Shield Built In | No |
| Fluid Fill Location | Case |
| Transmission Fluid | Included |
| Dipstick | Included |
| Application | Oval track and performance marine applications |
| Design Notes | Clutchless style; low gear only |
| Quantity | Sold individually |
The table above provides a quick reference for buyers who need the most important TCI 742020P1 transmission specifications without reading the complete product description. The combination of transmission type, gear count, bellhousing pattern, valve body, input spline, tailshaft length, included components, and application information can help buyers determine whether this specialized transmission is appropriate for their project.
Ordering and Product Support
The TCI Circlematic Transmissions 742020P1 has clearly identified manufacturer and product information, including TCI Auto as the brand and 742020P1 as the manufacturer’s part number. The Summit Racing part number is TCI-742020P1, and the UPC is 788120046527.
The unit is supplied as a remanufactured transmission and is sold individually. A torque converter, transmission fluid, and dipstick are included.
Buyers should carefully review the technical specifications before ordering. Particular attention should be given to the Chevy bellhousing pattern, 17-spline input, 11.250-inch tailshaft, slip-on yoke, full-manual valve body, two-speed configuration, and low-gear-only design.
It is also important to account for components that are not included. The 742020P1 does not include a flexplate, transmission controller, wiring harness, transmission cooler, or trans-brake.
For customers comparing this unit with other automatic transmissions, reviewing the complete application and drivetrain requirements is the best way to determine whether the Circlematic configuration is suitable.
Frequently Asked Questions
What is the TCI Circlematic 742020P1 transmission?
The TCI Circlematic 742020P1 is a remanufactured two-speed automatic transmission from TCI Auto. It uses a full-manual valve body, Chevy bellhousing bolt pattern, 1.82 first gear ratio, steel clutch hub, and low-gear-only configuration. TCI identifies the Circlematic transmission line for oval track and performance marine applications.
What applications is the TCI 742020P1 designed for?
The 742020P1 is designed for specialized performance applications. TCI identifies Circlematic transmissions for oval track use and also states that they can be used for performance marine applications. The specific two-speed, full-manual, low-gear-only configuration should be matched carefully to the intended drivetrain.
Does the TCI 742020P1 come with a torque converter?
Yes. The TCI 742020P1 includes a torque converter. The supplied specifications also confirm that transmission fluid and a dipstick are included. The flexplate, transmission controller, wiring harness, transmission cooler, and trans-brake are not included with the transmission.
What is the first gear ratio of the 742020P1?
The TCI 742020P1 has a 1.82 first gear ratio and uses a two-speed transmission design. The supplied product information describes it as a clutchless-style, low-gear-only transmission, making its specific gearing and configuration important considerations when matching it to a performance drivetrain.
Is the TCI 742020P1 lockup compatible?
No. The supplied specifications state that the TCI 742020P1 is not lockup compatible. Buyers should consider this specification when evaluating the transmission for a particular vehicle or performance application and when planning the overall drivetrain configuration.
What type of valve body does the TCI 742020P1 use?
The 742020P1 uses a full-manual valve body and has a reverse transmission shift pattern. This configuration distinguishes it from many conventional electronically controlled automatic transmissions and makes the transmission’s intended application an important consideration during product selection.
What is included with the TCI Circlematic 742020P1?
The transmission includes a torque converter, transmission fluid, and dipstick. It does not include a flexplate, transmission controller, wiring harness, transmission cooler, trans-brake, transmission shield, or flexplate shield. The transmission is sold individually and is supplied in remanufactured condition.
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