DRIVE TRAIN SECTION RED PART NUMBERS INDICATE NEW PARTS 7-57 1 2 3 4 5 6 7 8 9 10 11 CONTENTS ELECTRICAL FRAME FRONT END CONTROL WHEEL ENGINE DRIVE TRAIN FUEL EXHAUST GENERAL REFERENCE KEVLAR® CLUTCH KITS FOR BIG TWIN CLUTCH SPRING PLATE FOR BIG TWIN DIAPHRAGM Made with tried and true race proven Kevlar® friction material. The Kevlar friction plates can be run dry or in an oil bath. They are grooved for maximum oil circulation and heat dissipation. Bonded to your choice of 6061-T6 aluminum for light weight or bonded to high tempered steel for low expansion. All kits are packaged with friction plates and steel drive plates that have a pre-measured stack height for easy installation. Part 73176 Econo Kit includes 5 friction plates bonded to tempered steel. (Rpls. HD 37850-68) Part 73177 Kit includes 5 friction plates bonded to 6061-T6 aluminum and 4 tempered steel drive plates. (Rpls. HD 37850-68 & 37975-81) Part 73178 Extra Plate Kit includes 6 friction plates bonded to 6061-T6 aluminum with 5 tempered steel drive plates and 10 clutch springs. (Rpls. HD 37850-68, 37975-81 & 37077-68) Part 73179 Kit includes 6 friction plates bonded to tempered steel (25% wider than OE for maximum surface area) and 7 tempered steel drive plates. (Rpls. HD 37931-84 & 37975-84) Part 73180 Kit includes 8 friction plates bonded to tempered steel and 6 tempered steel drive plates. Use with 73038 or OE double riveted drive plate. Also includes a 15% stronger diaphragm spring. (Rpls. HD 37911-90, 37913-90 & 36792-91) Part 73181 Performance Extra Plate Kit includes 9 friction plates bonded to tempered steel and 8 tempered steel drive plates. Eliminates double riveted drive plate. Also includes 15% stronger diaphragm spring. (Rpls. HD 37911-90, 37913-90 & 37871-90) Part 73182* Part 73038 Kit includes 9 friction plates bonded to tempered steel and 8 tempered steel drive plates. Use without damper spring and retainer. (Rpls. HD 37932-98 & 37319-98) 1941/Early 1984 1998/2017 1990/1997 Late 1984/1989 Clutch Kits for Big Twin Fits Big Twin 1990/1997 (Rpls. HD 37977-90) • Updated features heavy duty stainless rivets instead of brass for longer service life. (*Except 2017 Milwaukee-Eight® Models)
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