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May 29, 2025 Service bulletin

2009-2010 trike transmission housing is obsolete

Harley-Davidson technical service bulletin M1689 for 2009-2010 Harley-Davidson Flhtcutg and 2010 Harley-Davidson Flhxxx.

Bulletin number
M1689
Component
Unknown or other
Summary
SERVICE BULLETIN M1689: 2009-2010 TRIKE TRANSMISSION HOUSING IS OBSOLETE. PURPOSE: Initial release. This bulletin informs dealers that Transmission Case (Part No. 83978-09) for 2009-2010 Trikes, is obsolete. Required Dealer Action: 1. If Transmission Case (Part No. 83978-09) is no longer available to order for a 2009-2010 Trike, order replacement Transmission Case (Part No. 83978-11). 2. Remove the 30 tooth drive sprocket and install either a new 32 tooth sprocket (Part No. 35000152A) or reuse the original 32 tooth sprocket, if it's in good condition.

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