Alpha One & Gen 2 Outdrive Parts *Drawings *Videos

Mercruiser Alpha 1 upper gearcase and gear ratio

Replacement complete upper drive shaft housing for Mercruiser 1/R/MR/ Alpha one outdrive years 1970 to 1990 *No core required Includes long yoke (drive shaft), U-joint and socket See our upper gearcase drawing page for photos and a list of all the internal parts and components included Serial #6225577 and up All gear ratios are available, refer to application chart below. Tech support exploded view drawings

GLM	OEM	Ratio	Engine
19100	1547-9421A20	1.50/1.47 (20/22)	MOST V8 UNDER 300 HP	$1199.99
19200	1547-9421A21	1.65/1.62 (24/24)	6 CYLINDER INLINE	$1357.95
19300	1547-9421A22	1.84/1.81 (17/19)	V6 & 470/485	$1199.99
19400	1547-9421A23	1.98/1.94 (20/24)	4 CYLINDER INLINE	$1375.95
19500	1547-9421A19	1.32/1.30 (16/20)	V8	$1313.95

Customers who bought P/N 81390 also purchased:
87510 Mercruiser seals gasket kit 26-33144A2	P/N 87510 seal kit for Mercruiser lower units 1970 - 1990 models. Replaces Mercury 26-33144A2. $42.95
21950 Bellows 30-803097T1	P/N 21950 For 1970 - 1990 Mercruiser models with serial numbers 3469428-0D46985. $145.95

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