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 6 Speed Transmissions & Builders Kit 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 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 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 6 SPEED TRANSMISSIONS AND CASES FOR SOFTAIL & CUSTOM USE 6 SPEED TRANSMISSION BUILDERS KIT Finish Part # As Cast 70374 Black Wrinkle 70375 Polished 70376 • 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. Fits Big Twin Models 1990/1999 Fits 1990/Later Big Twin 5 Speed Models • Precision ground 8620 gears and shafts. • Roller detent for smoother shifts. • Hardened steel shift forks for strength & durability. • Chrome plated billet trap door minimizes shaft flex. • Chrome plated top and side covers. • Includes 32 tooth pulley. • Update your Big Twin 5 speed with this 6 speed overdrive kit. • Precision ground 8620 gears and shafts. • Roller detent for smoother shifts. • Hardened steel shift forks for strength & durability. • Chrome plated billet trap door minimizes shaft flex. Part 72731 We Recommend Lucas Synthetic Gear Oil For Less Gear Noise & Longer Bearing Life We Recommend Lucas Synthetic Gear Oil For Less Gear Noise & Longer Bearing Life 70377 70379 70378 Includes 32 Tooth Pulley Pulley End Detail Finish Rpls HD # Part # Factory Cast 34774-99 70539 Wrinkle Black 34774-99 70540 Polished 34774-99 70541 Finish Part # Factory Cast 70377 Wrinkle Black 70378 Polished 70379 Transmission Cases Only Complete Transmissions
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