Cadillac 1967 VVI Data Book page 168

CONTROLLED DIFFERENTIAL
The Controlled Differential (optional at extra cost) provides
additional traction on snow, ice, mud, sand and gravel, particu-
larly when one rear wheel is on a surface providing poor
traction.
During normal driving and cornering, the controlled unit
functions as a standard differential. When one wheel en-
counters a slippery surface, however, the Controlled Differen-
tial directs driving force to the rear wheel having the better
traction.
CAUTION: On cars equipped with a Controlled Differ-
ential, do not run the engine for any reason with one rear
wheel off the ground, as the car may drive through the
rear wheel remaining on the ground.
CONVERTIBLE TOP
The convertible top can be raised or lowered with the rear
quarter windows either open or closed.
To lower the top, stop the car and rotate the locking handle
inboard on each side roof rail until the lock hook lever is dis-
engaged from the striker on the windshield header.
The convertible top control switch is located underneath the
left side of the instrument panel upper cover. Move switch
lever to the right (under the letters "DN") and hold lever in
this position until top is fully lowered.
To install top boot, place boot in position over folded top
and engage boot fasteners to the studs along the body molding
and on the rear quarter trim. Engage fasteners on front of boot
to studs on rear seat back panel. Press down on forward edge
of boot to secure hook and pile fastener.
To raise the top, always stop the car first. Then turn down
sun visors, and unsnap top boot. Move switch lever to the left
(under the word "UP") until top is fully raised and guide-studs
on lock assemblies are engaged in striker holes on windshield
header. Rotate each locking handle outboard until lock hook
lever is fully engaged with striker on windshield header and
handle is parallel with side roof rail.
NOTE: Be sure top is securely locked to windshield header
before starting car in motion.
For detailed information on the operation and care of the
convertible top, refer to the Convertible Top booklet in the
glove compartment of all convertibles.