This sale is for one refurbished Mercury Mariner Outboard Gear case.

This is a Mercury Factory gear case with no aftermarket parts.

All gears and bearings look like new with no wear on them at all.

This Mercury lower unit comes with new seals, water pump and impeller.

Fits: many Mercury and Mariner 35-45 HP outboard motors from 1987-1997. If you send me your HP and serial number, then we are glad check to see if it fits your engine.

This is for Long shaft. The shaft (with tip) measures 22.5 inches from the gear housing and has 11 splines.

The prop shaft has 13 splines.

2:1 Ratio 13/26 Gears

This Mercury Mariner lower unit is guaranteed good with no worn gears, bad bearings, cracks, corrosion, or bent shafts.

Casting Number on the case is 1643-9539-C

You will receive this exact lower unit that you see pictured.

Comes with a 30 day replacement warranty! Green Bay Prop offers the most used Stern Drive & Outboard parts in Wisconsin!


Please check your part numbers to ensure a proper fit for your application.

Feel Free To Ask Questions.