DRIVE TRAIN SECTION RED PART NUMBERS INDICATE NEW PARTS 7-2 1 2 3 4 5 6 7 8 9 10 11 CONTENTS REFERENCE GENERAL EXHAUST FUEL DRIVE TRAIN ENGINE WHEEL CONTROL FRONT END FRAME ELECTRICAL Big Twin 5, 6 Speed &Covers Gear Ratio 1ST 2.94:1 2ND 2.21:1 Gear Ratio 3RD 1.57:1 4TH 1.23:1 Gear Ratio 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 (Rpls. HD 37116-06) Fits Big Twin Models 2006/2016 • High quality chrome side cover for 6 speed transmissions. • See Section 6 for gasket. TRANSMISSION SIDE COVER FOR BIG TWIN 6 SPEED Part 70558 (Rpls. HD 34469-06B) (Rpls. HD 8967A) Fits Big Twin Models 2006/2016 Fits Big Twin Models 2006/Later • High quality chrome top cover for 6 speed transmissions. • See Section 6 for gasket. • High quality mainshaft bearing for 6 speed transmissions. • Sold each. TRANSMISSION TOP COVER FOR BIG TWIN 6 SPEED MAINSHAFT BEARING FOR BIG TWIN 6 SPEED Part 70559 Part 72735
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