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28
VACUMOTIVE DRIVE
HARNESS CHECK
NOTE: When making a harness check, disconnect
the complete Vacumotive Drive Harness: one wire
at instrument panel switch, socket plugs at clutch
power unit solenoid and accelerator switch and
wires at shift rail and governor switches.
A. Connect one lead of test lamp to negative battery
terminal, prod to clutch power unit plug socket No.
1. Lamp should not light.
B. With test lamp connected as in "A", ground the
wire removed from the instrument panel switch.
Lamp should light.
C. With test lamp connected as in "A" connect a
jumper wire between the clutch power unit plug socket
GEAR RATIO - PAGE 9-4
Up to August 24, 1949 two transmission gear
ratios were used in the 480-490 series cars as fol-
lows: 1.82:1 used with Drive-Master and 1.65:1
used on all standard transmissions without Drive-
Master equipment. The difference in these ratios
was effected by the number of teeth in the main shaft
drive gear and counter shaft cluster gear.
After approximately August 24, 1949 the 1.65:1
ratio was discontinued in production and only the
1.82:1 ratio will be standard with all transmissions
regardless of equipment.
The two ratios were identified by a metal tag
attached to the transmission cover screw.
NOTE: Main drive gears and countershaft clus-
ter gears will be available for either ratio through
your service parts department. When making
replacement repairs DO NOT use a main drive
gear of one ratio with a countershaft cluster gear
of another ratio or vice-versa.
No. 2 and a ground. Lamp should not light.
D. With jumper connected as in "C", connect a test
lamp between negative battery terminal and prod to
accelerator switch plug socket Nos. 1, 2 and 3 suc-
cessively. Lamp should light on No. 3 only.
E. Remove jumper wire, connect a test lamp be-
tween battery negative terminal, prod to No. 1 socket
of accelerator switch plug; lamp should light when
grounding governor switch wire but should not light
when wire disconnected from shift rail switch is
grounded.
F. With shift rail switch wire still grounded move
test lamp prod to the No. 2 accelerator switch socket
plug; lamp should light.
SECTION 9
TRANSMISSION
END PLAY - PAGE 9-4
Reverse Idler Gear .003" to .010".
MAIN DRIVE GEAR - PAGE 9-12
A change was made in the transmission main drive
gear, incorporating a stop ring to prevent overshift in
high gear position which resulted in premature wear
of the shift sleeve and fork.
The redesigned parts that are now in production
and will be supplied for service are as follows:
Transmission Main Drive Gear - less HDM -
1.65:1 Second Speed ratio Part 302471.
Transmission Main Drive Gear - with HDM -
1.82:1 Second Speed ratio Part 302472.
Transmission Main Drive Gear Stop Ring (2
required) Part 302468.
Transmission Main Drive Gear Stop Ring Center
(2 required) Part 302469.
Transmission Main Drive Gear Stop Ring Spring
(1 required) Part 302470.
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