S&S Cycle Transmission Case, 4-to-5 Speed - Manual (Page 2)

KIT DESCRIPTIONS AND PART NUMBERS
5-Speed Transmission Case for 1970 & later 4-Speed Frames
Trap Door Assembly.........................................................56-1027
Includes door bearings and miscellaneous hardware.
Case Assembly with Bearings and Seals.........................56-1038
Includes all items in 56-1051 plus the output shaft bearing,
counter-shaft bearing, case seals, and miscellaneous
hardware.
Case Assembly with Door................................................56-1039
Includes all items in 56-1051 plus our CNC-machined billet
trap door, trap door bearings, and miscellaneous hardware.
Case Assembly with Bearings & Seals for FX models.....56-1040
Includes all parts in 56-1038 plus the Starter/Battery Box
Bracket and Shift Linkage Kits for FL models.
Case Assembly with Door for FL models........................56-1041
Includes all parts in 56-1051 plus our CNC-machined billet
trap door, trap door bearings, miscellaneous hardware,
and the Starter/Battery Box Bracket and Shift Linkage Kits
for FL models.
Case Assembly with Bearings & Seals for FX models.....56-1042
Includes all parts in 56-1038 plus the Starter/Battery
Box Bracket, Shift Linkage, and Footpeg Adapter Kits
for FX models.
Case Assembly with Door for FX models........................56-1043
Includes all parts in 56-1039 plus the Starter/Battery
Box Bracket, Shift Linkage, and Footpeg Adapter Kits
for FX models.
Case Assembly..................................................................56-1051
Includes the transmission case and shift lever adjustment
screw, shifter shaft guide, and all studs and dowel pins
required for assembly.
Case Kit.............................................................................56-1053
Includes all items in kits 56-1038 and 56-1039, but none of
the FX-or FL-model accessory kits.
Case Assembly for FL models..........................................56-1054
Includes all items in 56-1051 plus the Starter/Battery Box
Bracket and Shift Linkage Kits for FL models.
Case Kit for FL models.....................................................56-1055
Includes all items in kits 56-1039 and 56-1038 plus the
Starter/Battery Box Bracket and Shift Linkage Kits for
FL models.
Case Assembly for FX models.........................................56-1056
Includes all items in Kit 56-1051 plus the Starter/Battery
Box Bracket, Shift Linkage, and Footpeg Adapter Kits for
FX models.
Case Kit for FX models.....................................................56-1057
Includes all items in Kits 56-1038 and 56-1039 plus the
Starter/Battery Box Bracket, Shift Linkage, and Footpeg
Adapter Kits for FX models.
INTRODUCTION
S&S ® transmission cases are made from 356T6 aluminum alloy
and machined with state-of-the-art CNC equipment.
5-speed Transmission Case 56-1051 is designed to fit 4-speed big
twin frames with 1970-84 shovelhead driveline and chain final
drive. See important notes below. Basic case package includes
shift lever adjustment screw, shifter shaft guide, and all studs and
dowel pins required for assembly.
To help insure a simple, trouble-free installation, studs and dowel
pins are installed at S&S prior to shipment. However, minor
machining will be required on the purchaser’s countershaft and
shift fork shaft.
S&S 5-speed transmission cases accept most OEM and
aftermarket 5-speed style trap doors, bearings, seals, and other
parts designed for 1985-1999 Softail transmissions.
NOTE: OEM trap door will require minor modification to clear
S&S Transmission Mounting Stud Adapter. See Picture 2 on pg 3.
Any 5-speed style shafts may be used if correct clutch and inner
primary cover are also used. This transmission case is not
compatible with factory Harley-Davidson
® primary belt drive used
on 1980-1983 FXSB Sturgis models.
Clutch assembly must be compatible with main shaft and main
drive gear. For applications that utilize an existing 4-speed
driveline, 1981 to 1984 5-speed style chain-drive mainshaft and
1981 to early-1984 style main drive gear must be used. These
parts are compatible with tapered i.d. clutch hub used on 4-speed
big twins.
NOTE: Low contact-style gears must be used in S&S 4-to-5
speed transmission case if 1981-1984 main drive gear is used.
Harley-Davidson introduced high-contact transmission gears
for big twins on 1994 international models and 1995 U.S.
models. Low and high contact gears may not be mixed.
Options for Transmission Case No. 56-1051 include bearings and
seals kit and CNC-machined billet trap door complete with
bearings and other required hardware. Case can also be ordered
with special battery box/starter brackets and shift linkage
required for 4-speed FX-and FL-models, and footpeg adapter kit
required for FX models. If these parts are not ordered, customer
must fabricate similar items to complete installation. See Figures
2-4 on pgs 7 & 8.
NOTES
G Transmission case will fit earlier big twin frames but engine
sprocket shaft must be type used in 1970-later big twins.
Transmission case itself is also compatible with H-D
®
secondary (rear) belt drive if correct mainshaft, main drive
gear, inner primary cover, starter shaft, and starter housing
are used. However, builder may encounter other obstacles
when converting motorcycle with chain final drive to belt
final drive.
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