Drive Shaft Housing And Gear Case Separation; Drive Unit Gear Ratio Identification - Mercury BRAVO Service Manual

DRIVE SHAFT HOUSING

Drive Shaft Housing and Gear Case Separation

Drive Unit Gear Ratio Identification

All drive unit gear ratios are identified on each drive in two places. It is important to note the
ratio of the drive unit before proceeding with any repairs. The first place to look is on the
decal on the port side of the drive housing. It will have a number such as (1.50R) and then
the seal number. The second place to look will be on the universal joint splined yoke. It will
be identified with a letter such as (F). This method is explained in the following chart. This
will be true for new or un-tampered with drive units. A drive unit could have had the gear ratio
changed for high altitude, which would void out any application of the following charts. The
gear ratio then would have to be determined by counting the teeth on the drive gear and the
driven gear in the drive shaft housing and using the following charts for reference.
Bravo One
U-JOINT IDENTIFICATION
NUMBER OF TEETH PER GEAR - DRIVE SHAFT HOUSING
Bravo Two
U-JOINT IDENTIFICATION
Page 3A-10
RATIO
1.65:1
1.50:1
1.36:1
RATIO
1.65:1
1.50:1
1.36:1
RATIO
2.20:1
2.00:1
1.81:1
1.65:1
U-JOINT SHAFT MARKING
DRIVE
23
27
27
U-JOINT SHAFT MARKING
SERVICE MANUAL NUMBER 28
C
F
H
DRIVEN
30
32
29
C
F
H
T
90-863160 MAY 2000