Drum, TH400 Forward Heavy Duty Sonnax 34554-01 New Item

img{max-width:100%}TH400 Forward Heavy Duty Sonnax DrumThe ideal GM TH400 upgrade for any power level, Sonnax heavy duty forward drum 34554-01 features 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" dia., 30-spline heavy duty input shaft  style="box-sizing:border-box; background-color:transparent; color:rgb(0, 84, 142);">30280-02, Sonnax 1-1/8” dia., 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 levelCompatible with Sonnax and other aftermarket 28-spline input shaftsOptimized for use with rubber clutch separators for applications with clean neutral setupsClutch spline major diameter is reduced slightly, and two sets of full-length clutch splines added to back up clutch separatorsLightening holes correspond to input speed sensor locations in aftermarket cases for more accurate converter and shift dataMiddle seal is eliminated — an aluminum clutch volume spacer kit 34554-11K is available separately for applications where clutch fill/drain time may be a concernSonnax high RPM checkball capsule 57510-01 is installed to eliminate pressure drop at high (5500+) RPM — a common problem with OE and other aftermarket checkballsAPPLICATIONS AMC Wagoneer 1965-1979 Buick  Century 1973-1974Century 1977-1979Electra 1965-1975Electra 1978-1979Electra 1980-1981LeSabre 1965-1971LeSabre 1972-1976LeSabre 1978LeSabre 1980-1981Riviera 1965-1976Riviera 1978Skylark 1973-1976 Cadillac  DeVille 1973-1984Fleetwood 1974-1984 (3 speed RWD) Chevrolet Blazer 1978-1979 (3 speed RWD)Camaro 1967-1974 (3 speed RWD)Caprice 1974-1976 (3 speed RWD)Chevelle 1967-1975Corvette 1967-1977Malibu 1972-1975Nova 1972-1973Nova 1975Truck 1965-1990 (3 speed 4x2)Truck 1977-1990 (3 speed 4x4)Van 1975-1990 (3 speed) GMC Jimmy 1978-1979 (3 speed RWD)Sprint 1971-1975 Holden   Holden 1975-Up Jaguar XJ12 1977-1981XJS 1978-1980 Oldsmobile  Cutlass 1973-1977Olds 98 1972-1981 (3 speed RWD) Pontiac Bonneville 1974-1977Catalina 1974-1977Firebird 1967-1976 (3 speed RWD)LeMans 1972-1977 (3 speed RWD)Tempest 1967-1971 (3 speed RWD) Rolls Royce Bently 1967-upSilver Spur 1968-1990Siver Shadow 1968-1990We build all ourtorque converters.Call if you need acustom stall for your build. We will build to yourvehicles specifications.  Parts ship daily from our distribution center.FREE SHIPPING on US OrdersIn a hurry - expedited shipping is available for this itemGOT QUESTIONS on yourspecific Year/Make/Model? Send us a message¿Habla español? Escríbanos con el año, la marca, y elmodelo de su vehículo.Visit our eBay Store:Phoenix Transmission PartsFor all of your Automatic Transmission Part needsCheck out my other items!Be sure to add me to your favorites list!