888845T09 Mercury 25" Extra Long Shaft Gearbox | Genuine Used Part

🔧 Product Description

Genuine Mercury 75HP-115HP Four-Stroke 25-Inch Lower Unit - Part Number: 888845T09

A genuine used Mercury complete extra-long lower unit for later 1.7L EFI 75HP, 80HP, 90HP, 100HP and 115HP four-stroke outboards. The 25-inch assembly uses a 2.33:1 ratio and is now discontinued as a new Mercury service unit.

⚙️ Key Features

• Genuine Mercury Marine complete gearcase
• Correct part number 1600-888845T09
• 25-inch extra-long shaft
• 2.33:1 reduction ratio
• Used across later 75HP to 115HP EFI four-strokes

🚤 Compatibility

Commonly used on

• Mercury 75 EFI FourStroke
• Mercury 80 EFI FourStroke
• Mercury 90 EFI FourStroke
• Mercury 100 EFI and 115 EFI FourStroke

Typically suits

• 75 EFI serial 1B366823 through 2B094995
• 80 EFI serial 0P459572 or 1B366823 through 2B094995
• 90 EFI serial 1B366823 through 2B094995
• 100 EFI serial 0P459572 or 1B366823 through 2B094995
• 115 EFI serial 1B366823 through 2B094995
• Common production approximately 2007-2014
• HP Range: 75HP - 115HP
• Shaft Length: 25 inches / XL
• Gear Ratio: 2.33:1
• Engine Type: 1.7L inline-four EFI four-stroke
• Fitment Requirement: Verify serial number, rotation and gear ratio

🔌 Function

The gearcase provides the reduction ratio required by the later 1.7L engine family, selects forward-neutral-reverse and pumps cooling water.

⚠️ Common Signs of Failure

• Gearbox has the wrong ratio for the engine
• Water or excessive metal in the oil
• Hard shifting or clutch wear
• Noisy gears or bearings
• Bent shaft, damaged skeg or cracked housing

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 888845T09 is the documented 25-inch 2.33:1 assembly
• 888845T07 and other 888845 revisions are related but differ by shaft, ratio or production specification
• The unit is no longer produced by Mercury

OEM / Related Numbers

• 1600-888845T09
• 888845T09
• 888845T07 related gearcase revision
• 888845T08 related long-shaft assembly
• 2.33:1 gear-set family
• Mercury 43024A7 related water-pump repair kit on listed diagrams

Aftermarket / Verified Equivalents

• Professionally remanufactured 888845T09 2.33:1 lower units
• Used genuine Mercury 75HP-115HP XL gearcases
• Aftermarket seal, bearing and water-pump kits
• Remanufacturers commonly retain serviceable OEM gears and replace worn bearings and seals
• 888845T02 is not a direct substitute because it has a 2.07:1 ratio

📦 Condition

• Genuine used part
• Removed from running engine or vessel where applicable
• In good working condition unless otherwise stated