Mercruiser Gearcase & Drive Parts

Sierra 18-7161-9 O-Ring (Pkg Of 5) Sierra replacement O-ring for Mercruiser and Mercury engines. I.D.: 3.250" or 82.6mm Width: 0.070" or 1.8mm Package of 5 Interchangeable with: GLM 80420 Mallory 9-76546 Mercruiser Stern...

Sierra Retainer Seal Kit 18-2469 This Sierra Retainer Seal Kit has Sierra's guaranteed fitment, backed by their lifetime warranty. It has a direct application fitment that exceeds OEM quality.  Interchangeable with: Mercruiser Stern...

Mercruiser 31-803096T-1 Bearing Repair Kit Genuine OEM Mercury-Mercruiser part. Fits Alpha One Gen II (s/n 0L100040 and up) Standard rotation (RH) Special Order Item.

Mercruiser 43-18411A-2 Upper Gear Set - 1.50:1 Genuine OEM Mercury-Mercruiser part. Fits: MC‑I, R, MR, Alpha One & Gen II (s/n 0K999999 and below) (1971‑1997) 22-20 Teeth 1.50/1.47 Ratio Special Order Item.

Mercruiser 43-18411A-4 Upper Gear Set Genuine OEM Mercury-Mercruiser part. For use w/ heavy duty 1.50 gears only. The HD 1.50 drive gear has a stepped bearing surface requiring the use of a special bearing kit having 2 different I.D...

Mercruiser 43-45814A-5 Upper Gear Set - 1.65:1 Genuine OEM Mercury-Mercruiser part. Fits: MC‑I, R, MR, Alpha One & Gen II (s/n 0K999999 and below) (1970‑1997) 24-24 Teeth 1.65/1.62 Ratio Special Order Item.

Mercruiser 43-55778A-3 Upper Gear Set - 1.98:1 Genuine OEM Mercury-Mercruiser part. Fits: MC‑I, R, MR, Alpha One & Gen II (s/n 0K999999 and below) (1970‑1997) 20-24 Teeth 1.98/1.94 & 2.40 Ratio Special Order Item.

Mercruiser 43-828073A-1 Reverse Gear Kit Genuine OEM Mercury-Mercruiser part. Fits: Alpha I Gen II 21 Teeth Application: Alpha One (Gen II) 1998 & Up - s/n 0L100040 & up Alpha One (Gen II) 1996-1997 - s/n 0F680000 thru...

Mercruiser 43-853641A-2 Upper Gear Set - 1.47 Genuine OEM Mercury-Mercruiser part. Fits: Alpha One Gen II (s/n 0L000040 and above) (1998 & newer) 22-20 Teeth 1.47 Ratio Special Order Item.

Mercruiser 43-853642A-2 Upper Gear Set - 1.94/2.4 Genuine OEM Mercury-Mercruiser part. Fits: Alpha One Gen II (s/n 0L000040 and above) (1998 & newer) and Vazer drive 20-24 Teeth 1.94 & 2.40 Ratio Alpha One Gen II 2.77 Ratio...

Mercruiser 43-853643A-2 Upper Gear Set - 1.81 Genuine OEM Mercury-Mercruiser part. Fits:  Alpha One Gen II (s/n 0L000040 and above) (1998 & newer) & Vazer drive 17-19 Teeth 1.81 Ratio Alpha One Gen II 2.58 Ratio Vazer Special...

Mercruiser 43-878087A-2 Forward Gear Set Genuine OEM Mercury-Mercruiser part. Fits: Alpha One Gen II (except 2.00 & 2.40 ratio) (s/n 0F680000 and above) 13‑21 Teeth  Standard Rotation (RH) Special Order Item.

Mercruiser 43-887906A-1 Bravo Upper Gear Set Genuine OEM Mercury-Mercruiser part. Fits: Bravo I X & XZ (1.36), II X (1.50 & 1.81) & III X (1.36 & 1.81) (2000 & newer) 27/29 Teeth Special Order Item.

Mercruiser 43-96084A-7 Forward Gear Set Genuine OEM Mercruiser part. Application: R/MR/Alpha One (Sterndrive) 1983-1990 (s/n 6225577 thru 0F386995) R/MR/Alpha One (Transom Assembly) 1983-1990 (s/n 6216687 thru 0F386995) Special Order Item.

Mercruiser 45-41939F-1 Black Driveshaft Assembly Genuine OEM Mercury - Mercruiser part. Application: R/MR/Alpha One (1983 - 1990) - s/n 6225577 thru 0F386995

MerCruiser 5-5010147CP Alpha One Gen I 1.47 Standard Rotation Sterndrive This is a replacement for MerCruiser Alpha One Gen I (1983 - 1990) outdrives with a 1.47 gear ratio, 6216687-0F386995 / 6225577-0F386995 Genuine OEM MerCruiser part. Special...

MerCruiser 5-5010194CP Alpha One Gen I 1.94 Standard Rotation Outdrive This is a replacement unit for MerCruiser Alpha One Gen I (1983-1990) standard rotation outdrives with a 1.94 gear ratio, 6216687-0F386995 , 6225577-0F386995. Genuine OEM MerCruiser...

MerCruiser 5-5111600TP Alpha One Gen II 2.00 Counter Rotation Outdrive This is a replacement for MerCruiser Alpha One Gen II (1998 & Up) outdrives with a 2.00 gear ratio, 0L100040 & Up. Genuine OEM MerCruiser part. Special Order Item

MerCruiser 5-5121400TP Alpha One Gen II 1.81 Standard Rotation Sterndrive This is a replacement for MerCruiser Alpha One Gen II (1998 & Up) outdrives with a 1.81 gear ratio, 0L100040 & Up. Genuine OEM MerCruiser part. Special Order Item

MerCruiser 5-5121600TP Alpha One Gen II 2.00 Standard Rotation Sterndrive This is a replacement for MerCruiser Alpha One Gen II (1998 & up) outdrives with a 2.00 gear ratio, 0L100040 & Up. Genuine OEM MerCruiser part. Special Order Item