Mercury NEW OEM 3.0L Lower Unit 880686T29 200 225 250 HP V6 1 YEAR WARRANTY

Mercury Marine OEM Gear Housing Assembly (Lower Unit) — Part Number 880686T29 Brand: Mercury Marine | Condition: New Old Stock (NOS)

You are purchasing a genuine Mercury Marine OEM complete gear housing assembly (lower unit), part number 880686T29. This is an authentic factory original part — never installed, never used.

Condition Details: This is a New Old Stock (NOS) part. The lower unit assembly itself is in new, uninstalled condition. As is common with NOS inventory, the original packaging may show signs of age, including shelf wear, dust, or minor cosmetic blemishes on the bag or box. The part is new and fully functional.

Specifications:

• Part Number: 880686T29 (also cross-referenced as 880686A43)
• Engine Family: Mercury 3.0L V6 2-Stroke Optimax DFI / EFI
• Driveshaft Length: 20" (Long / L model)
• Gear Ratio: 1.75:1
• Rotation: Standard (Right-Hand)
• Torpedo Diameter: 4.88"
• Driveshaft Splines: 13-spline
• Prop Shaft Splines: 15-spline
• Color: Black

Application / Fitment: This lower unit gear housing assembly fits the following Mercury Marine 3.0L V6 2-stroke outboard engines with serial number 1B504989 and above (2006 and up):

• Mercury Optimax 200 HP V6 3.0L — 20" shaft
• Mercury Optimax 225 HP V6 3.0L — 20" shaft
• Mercury Optimax 250 HP V6 3.0L — 20" shaft
• Mercury Pro XS 200 HP V6 3.0L — 20" shaft
• Mercury Pro XS 225 HP V6 3.0L — 20" shaft
• Mercury Pro XS 250 HP V6 3.0L — 20" shaft
• Mercury EFI 200 HP V6 3.0L — 20" shaft

Please verify fitment using your engine's exact serial number before purchasing. Mercury lower units are serial-number specific. This unit fits serial number 1B504989 and above. Engines below serial number 1B504989 use a different gear housing platform. Your serial number is located on the transom bracket of your outboard.

Part Number / Supersede Information:

• Primary OEM Part Number: 880686T29
• Cross-Reference / Alternate Part Number: 880686A43 (same assembly, alternate Mercury part number prefix)
• Related Family Part Numbers: 880686T33, 880686T34 (same gearcase platform, variant configurations)
• Part number 880686A43 has been superseded by updated Mercury Marine part number 8M0236250. The 880686T29 is the earlier T-suffix variant of the same assembly. Mercury Marine periodically supersedes part numbers as engineering updates are incorporated. We recommend verifying the current supersede chain through your local Mercury Marine authorized dealer or the official Mercury Marine parts catalog prior to ordering.

Why Choose OEM Parts? OEM parts are engineered and manufactured to exact factory tolerances, ensuring a precise fit, reliable performance, and long service life. Unlike aftermarket alternatives, OEM parts are designed specifically for your equipment — no modifications, no guesswork.

Returns: We proudly offer hassle-free returns. If you are not completely satisfied with your purchase for any reason, simply open a return request through eBay within 30 days of purchase and we will take care of you promptly.

Thank you for choosing QBS Parts, Inc! We truly appreciate your business. If you have any issues whatsoever with your order, please give us the opportunity to resolve it before leaving feedback — we are committed to making every transaction a great experience.

Please verify fitment using your equipment's model and serial number before purchasing. Feel free to message us with any questions — we're here to help!