DRIVE TRAIN SECTION RED PART NUMBERS INDICATE NEW PARTS 7-3 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 Big Twin 5, 6 Speed & Covers Gear Ratio 1ST 2.94:1 2ND 2.21:1 3RD 1.57:1 4TH 1.23:1 5TH 1.00:1 6TH 0.86:1 6 SPEED TRANSMISSIONS FOR SOFTAIL 1990/1999 Finish Part # As Cast 70374 Black Wrinkle 70375 Polished 70376 Finish Part # As Cast 70371 Black Wrinkle 70372 Polished 70373 • Precision cut forged gears made from materials that exceed 8620 steel. • 6th gear overdrive reduces your engine RPM by 500 RPMs. • All gears are standard width for performance and strength. • Includes Jims chrome plated trap door manufactured from 7075T billet aluminum for ultimate strength. • Chrome plated top and side covers round out these top quality transmissions. • A Manufacturer’s Statement of Origin is included. • Jims “Fat 5 Overdrive” is simply the strongest, toughest transmission made, period. • More compact shifter technology to increase the width and strength of every gear. • The width increase varies from 18% to 53% depending upon the loads each gear must carry. • The unique trapdoor and mechanical cable type side cover design extends approximately .560” from an OE side cover. Exhaust and exhaust bracket may need modifications. • Sprocket/pulley must be purchased separately.. • A Manufacturer’s Statement of Origin is included. FAT 5 SPEED OVERDRIVE TRANSMISSIONS FOR SOFTAIL 1990/1999 FAT Stock FAT GEAR five speed over drive • High quality chrome side cover for 6 speed transmissions. • See Section 6 for gasket. TRANSMISSION SIDE COVER FOR BIG TWIN 6 SPEED Description Rpls. HD Part # Touring Models 2007/2016, 37116-06 70558 Trike Models 2007/2016, Softail 2007/2017 & Dyna 2006/2017 (Rpls. HD 34469-06B) Fits Big Twin Models 2006/2016 • High quality chrome top cover for 6 speed transmissions. • See Section 6 for gasket. TRANSMISSION TOP COVER FOR BIG TWIN 6 SPEED Part 70559 (Rpls. HD 8967A) Fits Big Twin Models 2006/Later • High quality mainshaft bearing for 6 speed transmissions. • Sold each. MAINSHAFT BEARING FOR BIG TWIN 6 SPEED Part 72735
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