If you do not know your tire height, ask your tire dealer or
measure a tire as follows:
1. Place a chalk mark on the tire where it contacts the pave-
ment and also mark the pavement. These marks should be
at the center of the tire footprint pointing straight down to
the pavement.
2. Roll the vehicle in a straight line until the chalk mark
makes one revolution and is pointing straight down at the
pavement again. Mark the pavement again at this new spot.
3. Measure (in inches) the distance between the two (2) marks
on the pavement. Divide the measurement by 3.1416. This
will give you the tire height in inches.
F. REAR GEAR RATIO
• Press ‘N’ if the rear gear ratio has not been changed from the
factory installed gear. Making this choice will skip to the next
option.
• Press ‘Y’ if you have installed a rear gear with a ratio that
is different than the original factory gear. This feature will
recalibrate your speedometer/odometer readings and
part-throttle shifting for automatic transmissions for the
new gear ratio. Press the s and t arrows to see all of
the gear ratios available for your vehicle. Press ‘Y’ to
lock in the gear ratio that you have installed.
• Your factory rear gear code can be found on a sticker inside
your glove box or the underside of the trunk lid.
NOTE: For automatic transmissions, a selection of any of
the available rear gear ratios will automatically set
wide-open throttle shifts similar to original factory
RPM settings for the new rear gear ratio.
11
PRESS Y IF REAR AXLE RATIO HAS BEEN CHANGED
PRESS N TO KEEP STOCK REAR AXLE RATIO
USE UP/DOWN ARROWS TO CHOOSE REAR AXLE RATIO, THEN PRESS Y TO SELECT OR N TO EXIT.
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HOW TO DETERMINE TIRE HEIGHT
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