The T56 transmission, a robust six-speed manual, quickly became a favorite for high-performance applications. Initially featured in the Dodge Viper, its durability and precise shifting are renowned.
Tremec’s dedication to manufacturing quality transmissions for major automotive companies propelled the T56 to new production heights, establishing it as a premier aftermarket choice.
This transmission’s versatility led to its adoption by General Motors, Dodge, and Ford, showcasing its adaptability across diverse vehicle platforms and performance needs.
What is the T56 Transmission?
The T56 transmission is a highly sought-after, six-speed manual gearbox celebrated within the automotive performance community. Originally designed for the demanding application in the Dodge Viper, it quickly gained recognition for its exceptional strength and precise shifting capabilities.
This transmission isn’t simply a gearbox; it’s a foundational component for building high-performance vehicles. Its internal design and robust construction allow it to handle significant power and torque, making it ideal for modified cars and muscle cars. The T56 features a variety of gear ratios, contributing to its versatility.
Furthermore, the T56’s popularity has spurred numerous aftermarket upgrades and modifications, enhancing its performance and durability even further, solidifying its place as a cornerstone of manual transmission technology.
History and Origins of the T56
The T56 transmission’s story begins with its initial application in the first-generation Dodge Viper in the early 1990s. This demanding application necessitated a robust and reliable gearbox capable of handling substantial power. Tremec, a well-established manufacturer supplying major automotive companies, undertook this challenge.
Building upon their existing transmission expertise, Tremec engineered the T56 to meet the Viper’s performance requirements. This initial success quickly broadened the T56’s appeal, leading to its adoption by General Motors and Ford for various performance models.
Tremec continued refining the T56, leading to the development of subsequent variants like the Magnum and Super Magnum, each offering enhanced capabilities and catering to diverse performance needs, cementing its legacy.
Applications: Vehicles Using the T56
The T56 transmission found widespread use across a variety of performance vehicles from several manufacturers; Most notably, the first-generation Dodge Viper was its initial and defining application, showcasing its capabilities. General Motors quickly adopted the T56 for models like the Chevrolet Corvette (C4 and C5) and the Chevrolet Camaro/Pontiac Firebird (4th generation).
Ford also utilized the T56 in performance variants of the Mustang, specifically the SVT Cobra. Beyond these mainstream applications, the T56 became a popular choice for aftermarket swaps and custom builds, favored by enthusiasts seeking a robust and precise manual transmission.
Its versatility and strength made it ideal for a broad spectrum of vehicles aiming for enhanced performance and driving experience.
T56 Transmission: Core Components
The T56’s core features include a durable housing, precision gear sets, a robust input/output shaft system, and a clutch mechanism designed for high torque capacity.
Housing and Casing
The T56 transmission boasts a meticulously engineered housing, typically constructed from a high-grade, OEM-grade die-cast aluminum alloy. This material choice provides an optimal balance between strength and weight reduction, crucial for performance applications.
The 85mm center distance is a defining characteristic, contributing to the transmission’s overall rigidity and ability to withstand substantial torque loads. This robust casing effectively protects the intricate internal components from external damage and stress.
Furthermore, the design incorporates provisions for mounting various accessories, such as speed sensors and shift linkages, ensuring seamless integration within the vehicle’s drivetrain. The casing’s construction is fully reversible, simplifying maintenance and rebuild procedures.
Input Shaft and Clutch
The T56 transmission’s input shaft is a critical component, typically featuring 26 splines, designed to securely connect with the engine’s clutch. This robust connection transmits power efficiently from the engine to the transmission’s gearsets.
The input shaft material is carefully selected for high torsional strength, capable of handling significant torque without deformation or failure. Clutch compatibility is paramount; the T56 requires a clutch capable of matching its substantial torque capacity – up to 700 lb-ft effectively.
Proper clutch selection and adjustment are essential for smooth engagement and preventing premature wear on both the clutch and transmission components. Ensuring correct alignment between the engine, clutch, and transmission is also vital for optimal performance.
Output Shaft and Driveshaft Connection
The T56 transmission’s output shaft, typically equipped with 31 splines, serves as the final power delivery point before reaching the driveshaft. This robust connection transmits the selected gear ratio’s torque to the vehicle’s rear wheels, enabling motion.
A slip-yoke design is commonly employed, allowing for driveshaft length adjustments to accommodate suspension movement and prevent binding. The output shaft material, like the input, is engineered for high strength and durability, resisting torsional stress.
Proper driveshaft balancing is crucial to minimize vibrations and ensure smooth power transfer. Regular inspection of the driveshaft and its connection points is recommended to maintain optimal performance and prevent potential failures.
Gear Sets and Ratios
The T56 transmission utilizes a series of helical-cut gear sets to achieve its six forward speeds and reverse. Different variants, like the Magnum, offer distinct ratios tailored for specific applications – street, strip, or road racing.
Close-ratio gearsets (2.66, 1.78, 1.30, 1.00, 0.80, 0.63) provide tighter spacing between gears, maximizing acceleration, while wide-ratio sets (2.97, 2.10, 1.46, 1.00, 0.74, 0.50) prioritize top-end speed and fuel efficiency.
Precise gear engagement is vital for smooth shifting and longevity. Aftermarket gear sets are available for customization, allowing enthusiasts to fine-tune the transmission’s performance characteristics to match their vehicle and driving style.
T56 Transmission: Different Variants
The T56 evolved into several variants – Standard, Magnum (close and wide ratio options), and Super Magnum – each offering unique capabilities and performance characteristics for diverse applications.
Standard T56
The original T56 transmission, first appearing in vehicles like the Dodge Viper and various GM muscle cars, established the foundation for its subsequent iterations. It’s characterized by its robust construction and a proven track record in handling significant power.
This initial version typically features gear ratios designed for a balance between acceleration and highway cruising. While capable, it later gave way to the refined Magnum variant, addressing some limitations in torque capacity and durability.
The standard T56 remains a viable option for many builds, particularly those seeking a cost-effective entry point into the world of six-speed manual transmissions, offering a blend of performance and affordability.
Magnum T56
The Magnum T56 represents a significant upgrade over the standard T56, designed to address the demands of higher horsepower and more aggressive driving. It’s widely considered the aftermarket’s premier six-speed manual transmission, boasting enhanced durability and a stronger internal design.
Key improvements include a larger 85mm center distance and an effective torque capacity of 700 lb-ft. This makes it suitable for a broader range of applications, including heavily modified vehicles. The Magnum T56 is available in both close-ratio and wide-ratio configurations, catering to different performance goals.
Its OEM-grade die-cast aluminum housing and fully reversible design contribute to its reliability and ease of maintenance, solidifying its position as a top choice for enthusiasts.
Magnum T56 Close Ratio Gears
The Magnum T56 close-ratio gearset prioritizes acceleration and track performance. Featuring ratios of 2.97 (1st), 2.10 (2nd), 1.46 (3rd), 1.00 (4th), 0.74 (5th), and 0;50 (6th), it keeps the engine within its optimal power band during shifts. This configuration delivers quicker gear changes and improved responsiveness, ideal for road racing or autocross.
The tighter ratios minimize the RPM drop between gears, maintaining momentum and maximizing acceleration. While excellent for performance driving, close-ratio gears may result in a higher engine speed at cruising velocities. This can impact fuel economy and potentially increase engine wear over extended highway driving.
Careful consideration of driving style and intended use is crucial when selecting this gearset.
Magnum T56 Wide Ratio Gears
The Magnum T56 wide-ratio gearset offers a balance between acceleration and highway cruising. With ratios of 2.66 (1st), 1.78 (2nd), 1.30 (3rd), 1.00 (4th), 0.80 (5th), and 0.63 (6th), it provides strong off-the-line performance alongside comfortable high-speed operation.
This configuration excels in applications where both spirited driving and long-distance travel are common. The wider spread between gears allows for lower engine RPMs at cruising speeds, improving fuel efficiency and reducing engine stress. However, the larger jumps between gears may necessitate more frequent shifting during aggressive acceleration.
Choosing the correct ratios depends on the vehicle’s intended purpose and driver preferences.
T56 Super Magnum
The T56 Super Magnum represents Tremec’s pinnacle of performance manual transmissions. Built upon the foundation of the Magnum, it boasts enhanced strength and durability, capable of handling substantial power outputs. This transmission is designed for extreme applications, including high-horsepower muscle cars and dedicated track vehicles.
Featuring an 85mm center distance and a 700 lb-ft effective torque capacity, the Super Magnum provides exceptional reliability. It utilizes fully reversible TKO-style OEM-grade die-cast aluminum housings, ensuring both strength and ease of service. This transmission is a premium choice for enthusiasts demanding the utmost in performance and longevity.
Technical Specifications & Performance
The T56 transmission offers varied gear ratios, with torque capacities reaching 700 lb-ft. Weight and dimensions vary by variant, impacting vehicle handling and installation.
Torque Capacity
The T56 transmission’s torque capacity is a critical factor for performance and longevity, varying slightly between its different iterations. The standard T56 generally handles up to 450 lb-ft of torque, making it suitable for many modified vehicles.
However, the Magnum T56 significantly increases this capability, boasting an effective torque capacity of 700 lb-ft. This enhancement makes the Magnum ideal for high-horsepower applications, including those with supercharged or turbocharged engines.
The Super Magnum further extends this limit, designed for even more extreme power levels. Exceeding the transmission’s torque capacity can lead to premature wear, gear failure, and ultimately, costly repairs. Therefore, understanding your engine’s output is crucial when selecting a T56 variant.
Gear Ratios Explained
T56 transmission gear ratios dictate the balance between acceleration and top-end speed. Lower ratios (like 2.66 or 2.97) provide quicker acceleration from a standstill, ideal for drag racing or spirited driving. Conversely, higher ratios (0.63 or 0.74) prioritize fuel efficiency and higher top speeds on the highway.
Magnum T56s offer both close-ratio and wide-ratio options. Close-ratio gears (2.66, 1.78, 1.30, 1.00, 0.80, 0.63) keep the engine within its powerband during aggressive shifting. Wide-ratio gears (2.97, 2.10, 1.46, 1.00, 0.74, 0.50) offer greater versatility for street and track use.
Selecting the appropriate ratio set depends on the vehicle’s intended purpose and engine characteristics.
Weight and Dimensions
T56 transmission dimensions are crucial for ensuring proper fitment within a vehicle’s chassis. The T56 features a standard 85mm center distance, a key measurement for driveshaft compatibility. Its robust construction contributes to a substantial weight, typically ranging depending on the specific variant.
The TKO-style die-cast aluminum casing helps manage weight while maintaining structural integrity. Precise dimensions are essential for modifications and swaps, requiring careful consideration of tunnel clearances and mounting points.
Detailed specifications regarding length, width, and height are readily available from Tremec and aftermarket suppliers, aiding in accurate planning for installation.
Identifying a T56 Transmission
Identifying a T56 involves checking casting numbers and codes stamped on the transmission casing. Visual cues, like the housing style, also help determine the specific variant.
These identifiers are crucial for confirming the transmission’s origin and specifications, aiding in parts selection and compatibility assessments.
Casting Numbers and Codes
Locating casting numbers and codes is paramount for accurate T56 identification. These markings, typically found on the transmission casing, provide vital clues about its origin, manufacturing date, and specific variant. Decoding these numbers requires referencing Tremec’s documentation or online resources dedicated to T56 transmissions.
Common locations include the bellhousing section, the tail housing, and sometimes on the top of the case. The codes often reveal the plant where it was produced and the date of manufacture. Understanding these codes helps determine if the transmission is a genuine Tremec unit or a reproduction. Furthermore, these numbers are essential when sourcing replacement parts or verifying compatibility with other components, ensuring a proper fit and optimal performance.
Careful examination and accurate recording of these codes are crucial steps in any T56 assessment.
Visual Identification Features
Distinguishing a T56 often begins with visual cues. The overall casing shape and size are initial indicators, but subtle differences exist between variants. The tail housing length is a key feature; shorter housings typically signify earlier models, while longer ones denote later revisions like the Magnum.
Inspect the shifter mounting point – the standard T56 utilizes a unique remote shifter design. The presence of a speed sensor connector also helps confirm its identity. Furthermore, examining the input and output shaft splines (26-spline input, 31-spline output) provides valuable information. Careful observation of these external characteristics, combined with casting number verification, offers a reliable method for identifying a T56 transmission.
Paying attention to these details simplifies the identification process.
Determining the T56 Variant
Pinpointing the specific T56 variant requires a combination of visual inspection and decoding casting numbers. The Magnum T56, for instance, boasts a stronger 85mm center distance and a higher 700 lb-ft torque capacity compared to the standard T56.
Gear ratio configurations are crucial differentiators. Close-ratio Magnums feature ratios like 2.97, 2.10, 1.46, 1.00, 0.74, and 0.50, while wide-ratio versions offer different spreads. The Super Magnum further enhances strength. Examining the transmission’s tag, if present, often reveals vital clues. Cross-referencing casting numbers with online databases confirms the exact model and its specifications, ensuring accurate identification.
This detailed approach guarantees correct parts selection and compatibility.
Common Issues and Troubleshooting
Typical T56 problems include gear grinding, shifter malfunctions, and excessive noise. Addressing these often involves fluid checks, inspecting components, and potentially gear set replacements.
Prompt diagnosis prevents further damage and maintains optimal performance.
Gear Grinding
Gear grinding within a T56 transmission is a common symptom indicating synchronization issues or worn gear teeth. This often manifests during shifts, particularly into second or third gear, presenting as a harsh or scraping sound. Several factors can contribute to this problem, including low or contaminated transmission fluid, a worn synchronizer ring, or damaged gear dogs.
Insufficient lubrication hinders proper gear engagement, while worn synchronizers fail to smoothly match gear speeds. In severe cases, chipped or broken gear teeth will cause persistent grinding. Troubleshooting involves inspecting fluid condition, checking for play in the gears, and potentially disassembling the transmission for a thorough assessment of the synchronizer rings and gear teeth. Addressing this promptly prevents further damage and costly repairs.
Shifter Problems
Shifter issues in a T56 transmission often stem from worn or damaged components within the shift linkage or the transmission itself. Common complaints include difficulty selecting gears, a loose or sloppy shifter feel, or gears popping out of engagement. These problems can arise from worn shift forks, bent shift rods, or a failing internal detent mechanism.
External modifications, like aftermarket shifters, can sometimes exacerbate these issues if not properly installed or adjusted. Inspecting the shift linkage for play and ensuring proper alignment is crucial. Internal repairs may require disassembly to replace worn shift forks or address detent pin problems, restoring precise and reliable gear selection.
Noisy Operation
Unusual noises emanating from a T56 transmission can indicate several potential problems. Whining sounds often suggest worn bearings within the gearbox, while clunking noises may point to excessive play in the gears or differential. A rattling sound could be a sign of a loose or broken internal component. Proper fluid levels and condition are critical; low or degraded fluid can amplify existing noises.
Identifying the source of the noise requires careful diagnosis. Bearing failures typically worsen with speed, while gear noise may be more prominent during specific gear engagements. Ignoring these sounds can lead to further damage and potentially catastrophic transmission failure, necessitating a complete rebuild or replacement.
T56 Transmission Maintenance
Regular maintenance is crucial for T56 longevity. Fluid changes, thorough inspections for leaks, and preventative measures ensure optimal performance and prevent costly repairs down the road.
Fluid Changes
Maintaining the correct fluid level and condition is paramount for T56 transmission health. Regular fluid changes are essential, typically every 30,000 miles under normal driving conditions, but more frequently with aggressive use.
Using the manufacturer-recommended fluid type is critical; incorrect fluids can lead to premature wear and shifting problems. A complete fluid flush, rather than just a drain and fill, is often recommended to remove all contaminants.
During a fluid change, inspect the fluid for metal shavings, a sign of internal wear. Consider the driving style and conditions when determining the fluid change interval, adjusting for track use or heavy towing.
Proper fluid maintenance significantly extends the T56’s lifespan and ensures smooth, reliable operation.
Inspection Procedures
Regular inspection of the T56 transmission is vital for identifying potential issues early. Begin by checking for external leaks around the housing, input, and output shafts. Examine the shift linkage for smooth, precise movement, noting any looseness or binding.
Inspect the fluid level and condition; dark, burnt fluid or the presence of metal particles indicates internal wear. Listen for unusual noises during operation, such as whining or grinding, which could signal gear damage.
A thorough visual inspection of the transmission mount ensures it’s secure and not damaged. Pay attention to the driveshaft connection for proper alignment and lubrication. Consistent inspections help prevent costly repairs.
Early detection of problems ensures continued reliable performance.
Preventative Maintenance
Proactive preventative maintenance significantly extends the life of your T56 transmission. Regular fluid changes, typically every 30,000 miles, are crucial, using the manufacturer’s recommended fluid type. Inspect the shift linkage periodically, ensuring proper adjustment and lubrication for smooth operation.
Check for any external leaks and address them promptly to prevent fluid loss and potential damage. Avoid harsh shifting and aggressive driving habits that can strain internal components. Regularly inspect the transmission mount for wear or damage.
Maintaining proper fluid levels and addressing minor issues quickly prevents major, costly repairs. Consistent care ensures reliable performance and longevity.
A well-maintained T56 will provide years of enjoyable driving.
Upgrading and Modifications
Enhance your T56 with aftermarket gear sets for tailored ratios, improved shifters for precision, and ensure clutch compatibility for optimal performance and reliability.
Aftermarket Gear Sets
Aftermarket gear sets unlock the T56’s full potential, allowing customization for specific driving styles and vehicle applications. Swapping gear ratios dramatically alters acceleration and top speed characteristics.
Close-ratio sets, like those found in the Magnum T56, prioritize quicker acceleration through tighter gear spacing, ideal for road racing and autocross. Conversely, wide-ratio sets enhance cruising comfort and fuel efficiency, suitable for highway driving and long distances.
Careful consideration of engine torque curves and intended use is crucial when selecting a gear set. Upgrading requires professional installation and potentially supporting modifications to ensure optimal performance and longevity of the transmission.
Choosing the correct ratios can transform the driving experience, maximizing the T56’s capabilities.
Shifter Improvements
Shifter improvements are a popular upgrade for the T56 transmission, addressing common complaints about feel and precision. The factory shifter, while functional, often exhibits excessive play and vague engagement.
Aftermarket short-throw shifters significantly reduce throw length, enabling quicker and more direct gear changes. These kits typically include adjustable stops, allowing drivers to fine-tune shifter feel to their preference.
Upgraded shifter bushings, replacing the stock rubber components with polyurethane or brass, eliminate unwanted movement and improve tactile feedback. Combined, these modifications enhance the driving experience, providing a more connected and confident feel.
Precise shifting is vital for maximizing performance and enjoyment.
Clutch Compatibility
Clutch compatibility is crucial when installing or upgrading a T56 transmission. The T56’s increased torque capacity necessitates a clutch capable of handling the power. Stock clutches often lack the clamping force required, leading to slippage and premature wear.
Aftermarket clutches designed for the T56 are available in various configurations, including single-disc, twin-disc, and multi-disc setups. Selecting the appropriate clutch depends on the engine’s power output and intended use.
Consider the clutch disc diameter, friction material, and pressure plate clamping force. Compatibility with the T56’s input shaft spline count (typically 26-spline) is also essential. Proper clutch selection ensures optimal performance and reliability.
Matching the clutch to the transmission is key.
Cost and Availability
T56 transmission costs vary widely; new units can be substantial, while used options offer affordability. Availability depends on the specific variant and current market demand.
Sourcing from reputable suppliers ensures quality and support, though prices fluctuate based on condition and included components.
New T56 Transmission Costs
New T56 transmissions represent a significant investment, reflecting their robust construction and performance capabilities. A standard, new T56 can range from approximately $1,800 to $2,500, depending on the retailer and any included accessories. However, the popular Magnum T56 variants command a higher price point;
A new Magnum T56, known for its enhanced torque capacity and updated features, typically falls between $2,500 and $3,500. The Super Magnum, offering even greater strength and durability, can exceed $4,000. These figures don’t include shipping costs or potential installation fees.
Furthermore, specialized gear ratios or custom configurations will add to the overall expense. Purchasing directly from Tremec or authorized dealers often guarantees authenticity and warranty coverage, justifying the premium cost.
Used T56 Transmission Costs
Used T56 transmissions offer a more budget-friendly entry point for enthusiasts, though condition significantly impacts pricing. A standard, used T56 can be found for between $800 and $1,500, depending on mileage and overall condition. Magnum T56s generally command higher prices in the used market.
Expect to pay between $1,200 and $2,000 for a used Magnum, with Super Magnum variants ranging from $1,800 to $2,800. Thorough inspection is crucial when purchasing used, verifying gear functionality and checking for any signs of damage or wear.
Online marketplaces and forums are common sources, but buyer beware – warranties are often limited or nonexistent. Factor in potential repair costs when evaluating a used transmission’s overall value.
Where to Purchase a T56 Transmission
Several avenues exist for acquiring a T56 transmission, catering to different budgets and preferences. Established performance parts retailers like Summit Racing and Jegs High Performance consistently stock both new and rebuilt units. These offer warranties and technical support.
Online marketplaces such as eBay and Craigslist present opportunities for finding used transmissions, often at lower prices, but require diligent inspection and carry inherent risks. Dedicated forums, like those focused on specific vehicle platforms (e.g., LS1Tech), frequently feature classifieds sections.
Tremec’s official website lists authorized dealers, providing access to genuine parts and expert assistance. Local transmission shops may also source and install T56s.