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Sonnax Smart-Tech drum modules for racing GM TH400 transmissions improve on-track performance and consistency, leading to quicker ETs, more wins, and greater reliability. The TH400 is preferred for its overall durability and multitude of available ratios, but is known to be heavier and less efficient than the popular two-speed Powerglide. Part of the TH400 inefficiency results from the fact that the direct drum counter-rotates, spinning backwards in 1st gear, brakes to a complete stop on the 1-2 shift, then goes from 0 RPM to input RPM on the 2-3 shift. Significant energy is wasted through this cycle that robs power, upsets traction on the shifts, and contributes to broken internal parts. Compared to aluminum direct drums, the Smart-Tech drum module reduces the weight of the counter-rotating components by over 3.3 lbs.! And more significantly, because the weight of the Sonnax counter-rotating parts is closer to the centerline, there's a 68 percent reduction in energy required to stop and restart during the 1-2 and 2-3 shifts. The benefits are increased wheel horsepower, better acceleration, less shock on the shifts, and improved durability. * Complete kit (34555-01K) replaces both forward and direct drums and includes everything from intermediate sprag to the pump; a selection of Sonnax input shafts is available separately. * 100 percent new content, no used core pieces * Includes larger-diameter, 36-element sprag and sprag race that works with OE intermediate clutches * Includes six-friction forward clutch pack and seven-friction direct clutch pack Contents: * Forward Piston Housing * Forward Piston * Forward Piston Return Springs (16) * Forward Spring Retainer * Forward Snap Ring * O-Ring 1.674 in. * Lip Seals (2) * Direct Housing Assembly * Direct Piston * Direct Piston Return Springs (26) * Direct Spring Retainer * Direct Snap Ring * O-Ring 2.737 in. * Sprag Shaft * Front Sprag Retainer Plate * Heavy-Duty Sprag 36 Element * Outer Sprag Race * Rear Sprag Retainer Plate * Sprag Retainer Screws (4) 6-32 x 5/16 in. * Quad Ring Seals (2) * Anti-rotation Seal Rings (2) * Drum * Pressure Plate * Outer Snap Rings (4) * Bearing Small * Forward Clutch Hub * Bearing Large * Direct Clutch Hub * Steel Clutch Plates (4) .060 in. * Steel Clutch Plates (11) .077 in. * Friction Clutch Plates (13) .080 in. * Clutch Separators (60) .103 in.
Not Yet Reviewed
$3,052.40
Failure of the intermediate stub shaft and direct drum are almost inevitable when transmissions are pushed to the limit. To maximize durability and improve clutch capacity in heavy-duty/performance vehicles, Sonnax offers Smart-Tech direct clutch drum and shaft kits, the first upgrade to eliminate every critical weakness. Most failures in these units occur where the direct drum and stub shaft connect. Even other aftermarket upgrades that rely on a heavy-duty shaft will sheer in this area under extreme conditions. Unlike two-piece assemblies, the all-in-one Smart-Tech easily handles the highest horsepower/torque levels. The unique one-piece clutch drum with integrated stub shaft is precision machined from high-strength steel to guarantee there are no splines to strip from the drum or weaken the shaft. The shaft itself is significantly thicker and 2 times stronger than the original. Due to its larger diameter, the integrated shaft must be used with the kit's custom, heavy-duty sun gear. Insufficient holding power is another area where many transmissions fall short, but installing thinner aftermarket steels and backing plates to increase clutch capacity isn't ideal. Those components increase clutch pack flex and heat build-up, making them the primary cause of repeat burn-up. To improve both performance and long-term reliability, the Smart-Tech's custom drum and piston hold an OE backing plate and seven OE frictions for 17 percent more clutch capacity than the six-friction stack-up. Sonnax Smart-Tech direct clutch drum and shaft kits feature: * One-piece design that eliminates weak point where drum splines strip and shafts break * Rugged shaft is 50 percent thicker and twice as strong as OE * Custom drum and piston deliver 17 percent more clutch capacity with optimum protection against burn-up * High-strength drum and shaft are precision-machined from hardened 8620 steel * Unique sun gear is precision-machined from 9310, heat-treated steel
( 1 )
$754.00
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$1,537.27
Racing requires high performance parts and quick reactions. FTI Performance automatic transmission direct drums are built for the rigors associated with world-class racing. These replacement parts are constructed from top-of-the-line materials for strength and precise fitment. Order the model recommended for your transmission application.
( 7 )
$155.00
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$899.00
Maximize your transmission's power potential! TCI sprag and drum assemblies are designed to reduce rotating mass without compromising drum integrity. They will hold up to five clutches and are hard coated for improved wear characteristics.
( 6 )
$299.95
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$548.95
Most racing is done using a modified version of a factory automatic transmission. Today's high-tech, high-horsepower engines transfer incredible amounts of torque through these transmissions to the driveline. Summit Racing™ automatic transmission drums improve performance, reliability, and holding power. Whether by using beefier designs than factory parts, by adding larger/extra clutches, or using lighter, stronger materials, you'll get down the track and keep going rounds when you include Summit Racing™ transmission drums in your build.
Not Yet Reviewed
$1,024.99
ATI Performance automatic transmission drums eliminate the need for steel bushings and sleeves that can expand under heat and come loose, ultimately causing transmission failure. They come equipped with Torrington bearings and are designed to triple clutch life and lower ETs.
( 9 )
$139.00
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$1,074.99
Sonnax 10-clutch drum kits are optimized for Powerglide performance applications. Using the patented Sonnax 10-clutch drum system, the drum and piston accept 10 frictions and 10 Kolene steels, increasing lockup surface to allow significantly more torque than modified OE drums. The drum features a piston bore that is .060 in. deeper for greater piston travel. Kits include: * Complete 10-clutch drum kit with all related parts, including installed PTFE-coated bushing * Includes ten .060 in. frictions and ten .060 in. thick, 12-tooth Kolene steels * Excess material removed from high-strength, cast steel drum to reduce rotating mass * 6061 forged aluminum piston will not crack at high operating pressure like cast pistons * Forged chromoly steel clutch hub with lightening holes
( 1 )
$490.36
For high performance parts and excellent workmanship, trust FTI Performance automatic transmission input shaft and drum kits. With options like steel, Ermet, or 300M input shaft and drum kits, FTI has units available for various racing needs.
( 2 )
$399.00
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$679.00
Sonnax 10-clutch drum, hub and piston kits are optimized for Powerglide performance applications. Using the patented Sonnax 10-clutch drum system, the drum and piston accept 10 frictions and 10 Kolene steels, increasing lockup surface to allow significantly more torque than modified OE drums. The drum features a piston bore that is .060 in. deeper for greater piston travel. Sonnax 10-clutch drum, hub and piston kits include shims to make installation easy.
( 2 )
$191.36
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$494.00
The ideal GM TH400 upgrade for any power level, Sonnax heavy-duty forward drums (34554-01) feature a unique combination of high-strength, light weight, and a cutting-edge design to optimize transmission performance. Racing applications quickly push the heavy, cast-iron OE drum over its limits, with failure most common at the weak point where the shaft and drum connect. The problem can be addressed with a larger spline and lighter-weight aftermarket aluminum drum—but durability becomes a huge issue with wear of the clutch splines, shaft spline connection, and seal ring bore. To dramatically reduce weight and deliver the ultimate in reliability, the Sonnax high-strength, chromoly steel drum is custom-engineered with several lightening features for a low rotating mass. It weighs 3 lbs. less than the OE drum and is just 3 oz. heavier than a common aluminum drum. Weight is reduced carefully, without compromising strength, by ribbing the front of the drum, adding clutch splines (28 vs. 14) and lightening holes, plus reducing the diameter inner section of the drum at the middle seal ring area. This versatile drum upgrade has an oversized 28-tooth shaft-to-drum spline and can be used with a variety of input shaft styles. This includes Sonnax 1 in. diameter, 30-spline heavy-duty input shaft 30280-02, Sonnax 1 1/8 in. diameter, 35-spline big input shaft 35280-02, and other aftermarket shafts with 28-spline connection between shaft and drum: * Ultra-modern drum delivers both high-strength and light weight for unrivaled performance at any power level * Compatible with Sonnax and other aftermarket 28-spline input shafts * Optimized for use with rubber clutch separators for applications with clean neutral setups * Clutch spline major diameter is reduced slightly, and two sets of full-length clutch splines added to back up clutch separators * Lightening holes correspond to input speed sensor locations in aftermarket cases for more accurate converter and shift data * Middle seal is eliminated—an aluminum clutch volume spacer kit 34554-11K is available separately for applications in which clutch fill/drain time may be a concern * Sonnax high-RPM checkball capsule 57510-01 is installed to eliminate pressure drop at high (5500+) RPM, a common problem with OE and other aftermarket checkballs
Not Yet Reviewed
$358.80
Broken clutch drum? Experiencing no forward engagement or slipping in 1st, 2nd, and 3rd gear? Sonnax Smart-Tech forward clutch drums offer the solution to restore proper gear engagement and hold. Their one-piece forged steel construction provides increased strength and durability over the OE-stamped drum. They also feature an increased groove depth to provide additional ring support.
( 6 )
$172.70
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$260.00
Sonnax 10-clutch drums are optimized for Powerglide performance applications. Using the patented Sonnax 10-clutch drum system, the drums accept 10 frictions and 10 steels, increasing lockup surface to allow significantly more torque than modified OE drums. They feature a piston bore that is .060 in. deeper for greater piston travel than was available from earlier Sonnax 10-clutch drums. Features include: * Drum holds .060 in. frictions and .060 in. thick steels (10 each) * Excess material removed from high-strength, cast steel drum to reduce rotating mass * Accepts 24 or 12-tooth steels * Use with Sonnax clutch pistons and 10-clutch hubs with lightening holes Note: Sonnax 10-clutch drums and pistons should only be used as matched parts.
( 1 )
$156.00
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$374.40
For strong shifts with less slippage, consider FTI Performance automatic transmission pro-mod direct drums. These kits include high-carbon intermediate clutches, intermediate steels and wave plate, a clutch hub bearing, and a custom intermediate pressure plate. Order the model recommended for your transmission application.
Not Yet Reviewed
$999.00
RevMax 700 input clutch drums eliminate worrying about burning up your transmission. Billet aluminum models are available pre-built or unassembled. Billet steel models do not include clutches or steels. RevMax drums are packed with state-of-the-art features: * Anodized for the utmost in wear resistance and the highest durability * 29 percent additional clutch surface area vs stock * Fully balanced and blueprinted assemblies to ensure worry-free operation * Thicker sidewalls give the drum more rigidity in space and ensure that it will not flex under high pressure * Custom cooling circuit design gets hot fluid out quickly and brings in cooled fluid to help clutches and steels resist warping * RevMax exclusive seal design, ensures zero leakage and full clutch apply * Tested to 700 hp, these drums are great for moderately modified trucks and can also be used in stock applications * Must be used with a RevMax valve body assembly in order to benefit fully from its installation
Not Yet Reviewed
$1,099.00
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