Mercury ProXS Lower unit (4 Cyl.) 4-STROKE 75-115HP years 2014-2024

These are brand new Mercury or remanufactured outboard lower units (gearcases) for Mercury 4-cylinder 4-stroke engines in the 75hp, 90hp, 115hp (including Command Thrust and Pro XS variants) range from 2014 to 2021. Select your preference (new or reman) at checkout or via inquiry. Reman units are rebuilt with all new bearings, seals, gears, and updated parts for often-better-than-OEM reliability.

Key Features and Specs:

• Propeller Shaft: 15 splines (standard for Mercury 75-115hp 4-cylinder 4-stroke models, including Command Thrust and Pro XS; compatible with most props—recommend Flo-Torq IV hub kit #835257K10 to reduce clutch rattle where applicable).
• Water Pump: Included (not pre-installed—install during setup, add gear oil, and the unit is ready).
• Drive Shaft: Not included—reuse your existing drive shaft (snaps in on these models). Contact us if a replacement is needed.
• Warranty: Comes with a 1-year manufacturer warranty. A 12-month extended warranty is available for an additional $540.
• Core Policy: If returning a core (your old lower unit), credit is determined by condition inspection. Maximum core value for this lower unit is $200.

Important Selection Tip: To ensure exact fitment (shaft length, rotation—standard or counter-rotating—gear ratio typically 2.07:1 or 2.33:1 depending on model like Command Thrust/Pro XS, and specifics), please provide the serial number and model number from your motor's transom bracket. This is crucial for matching these 4-cylinder 4-stroke gearcases accurately.

Availability: These units are normally not stocked in-store and ship directly from the manufacturer. Contact us for current pricing, stock, lead times, new vs. reman options, and any add-ons (extended warranty, drive shaft, etc.).

Available Configurations and Shaft Lengths (Contact us for exact pricing, availability, and upcharges):

If you have questions, need help verifying compatibility, or want quotes on related parts (e.g., drive shaft, gear lube kit, Flo-Torq hub), email us at jhawknz@gmail.com or call 615-691-1433—we're happy to assist with your purchase!

About Us: Hawkeye Marine, LLC—located in La Vergne, Tennessee—is your trusted source for high-quality marine parts. As a dealer for industry leaders like OBR Parts and Marine (established 1982), we deliver top-tier new and remanufactured outboard components with expert technical support, prompt shipping, and nationwide service for marine dealers and boaters alike.