Page 464 of High Performance Parts for American V-Twins 2008 by S&S Cycle

drive train transmission cases continued ­ s&s® 5-speed transmission case for 4-speed big twins fl shift linkage kit 57-4756 notes 4 and 5-speed transmissions utilize the same 1:1 final drive ratio as a result the 5-speed gear set will not alter engine rpm at highway speeds the additional gear narrows the gap between lower gears for improved acceleration and better performance in traffic this transmission case will fit earlier big twin frames however the engine sprocket shaft must be of the type used in 1970-later big twin style engines the transmission case 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 parts are used however the builder may encounter other obstacles when converting a motorcycle 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 match the 1980 84 main drive gear required harley-davidson® replaced low-contact gears with high-contact gears on 1994 international model 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 door and 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 high-performance applications most 4-speed big twin style engines utilize transmission-driven mechanical speedometers this transmission case has no provision for speedometer drive and must be used with a wheel-driven speedometer and speedometer drive the existing wheel may require modification to accept the speedometer drive unit the clutch-actuator end of the 4-speed clutch cable is not compatible with the five-speed type clutch actuator options are to replace the existing clutch lever with an 1987 99 style lever or purchase a custom cable with the correct ends from barnett tool and engineering in ventura california phone 805-642-9435 fx shift linkage kit 57-4750 fl battery box bracket kit 57-4606 optional accessories for s&s® 4 to 5-speed transmission cases description billet trap door fl battery box bracket fl shift linkage fx battery box bracket fx shift linkage fx footpeg mount part no 56-1027 57-4606 57-4756 57-4605 57-4750 57-4604 msrp $205.95 $32.45 $104.95 $29.95 $99.95 $119.95 trap door assembly 56-1027 11-15 visit us at www.sscycle.com

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