1926-1984 Vintage Models - S&S Cycle

S e ction 5:S&S ®Parts forTwin Cam 96 /103 2007-2012Parts forTwin Cam 88 ®1999-2006Parts forEvolution ®1984-19995-Speed Transmission Casefor 1965-'85 4-Speed Big TwinsS&S 4 to 5-speed transmission cases are designed to convert 4-speed big twin frames with1965-’85 shovelhead style drivelines and chain final drives to 5-speed transmission (seenotes below). Includes the shift lever adjustment screw, shifter shaft guide, and all studsand dowel pins required for assembly. Studs and dowel pins are installed. Accepts mostOEM and aftermarket 5-speed style trap doors, bearings, seals, and other parts designedfor 1985-’99 big twin 5-speed transmissions. The OEM trap door will require minormodification for use with this case. All modifications are explained in the instructions. Mainand counter shaft bearings and seals are not included.1926-1984 Vintage ModelsParts forSportster ® & Buell ®1986-2012Parts forVintage Engines1926-1984Parts forX-Wedge®2007-2012Parts forVictory®, Off-road& MetricRacingProductsTools & ShopSuppliesDealer Services& Promo ItemsWarranty &Company PolicyOEM Cross ReferenceAppendix & IndexPERFORMANCEPARTSFitment• 1965-’85 big twin 4-speed chassisFeatures and benefits• Update 4-speed bikes to 5-speed transmission• CNC machined from 356-T6 aluminum castings• Accepts most OEM and aftermarket parts designed for 1985-’99 big twin 5-speedtransmissions• These items available for purchase separately –see next page• CNC-machined billet trap door with bearings and required hardware• Special battery box/starter brackets• Shift linkage required for 4-speed FX and FL models• Footpeg adapter kit required for FXKit Contents• Transmission case assembly• Required hardware• InstructionsS&S® 4 TO 5-SPEED TRANSMISSION CASE KITDescriptionPart No.Basic Case Assembly Kit 56-1051Replacement parts on page 5-104NOTE:The S&S 4 to 5-speed transmission case is not compatible with the factory Harley-Davidson® primary belt drive used on 1980-’83 FXSB Sturgis models.For applications that utilize an existing 4-speed driveline, a 1980 to early ‘84, 5-speedstyle chain-drive mainshaft and 1980 to early ‘84 style main drive gear must be used.These parts are compatible with the tapered I.D. clutch hub used on 4-speed big twins.4 and 5-speed transmissions utilize the same 1:1 final drive ratio. As a result, the 5-speedgear set will not alter engine RPM at highway speeds. The additional gear narrows thegap between lower gears for improved acceleration and better performance in traffic.This transmission case will fit earlier big twin frames. However, the engine sprocketshaft must be of the type used in 1970-later big twin style engines. The transmissioncase itself is compatible with H-D® secondary (rear) belt drive if the correct mainshaft,main drive gear, inner primary cover, starter shaft, starter housing, and related partsare used. However, the builder may encounter other obstacles when converting amotorcycle with chain final drive to belt final drive.The purchaser’s countershaft and shift fork shaft will require shortening.A low contact-style countershaft gear must be used in this transmission case to matchthe 1980-’84 main drive gear required. Harley-Davidson® replaced low-contact gearswith high-contact gears on 1994 international big twin models and 1995 U.S. models.Low and high contact gears may not be mixed.S&S trap doors are of the 1987-’99 style. S&S recommends using this style trap doorand end cover with the "ball and ramp" clutch actuator. The strength of the earlier,lever-type actuator is marginal for heavy clutch springs sometimes required in highperformanceapplications.Most 4-speed big twin style engines utilize transmission-driven mechanicalspeedometers. This transmission case has no provision for speedometer drive, and mustbe used with a wheel-driven speedometer and speedometer drive. The existing wheelmay require modification to accept the speedometer drive unit.The clutch-actuator end of the 4-speed clutch cable is not compatible with the fivespeedtype clutch actuator. Options are to replace the existing clutch lever with an1987-’99 style lever or purchase a custom cable with the correct ends from Barnett Tooland Engineering in Ventura, California. (Phone: 805-642-9435)5-78Order toll free 866-244-2673