GMC TopKick 2007 Owner's Manual page 115

® ®
Eaton Fuller Five and Six-Speed
Transmissions and TTC Spicer
Seven-Speed Transmissions
These transmissions have gears that automatically
synchronize when you shift up or down (except
FIRST (1) gear on the five-speed and seven-speed
transmission which is unsynchronized). Choose
the gear that will maintain the road speed you want
while keeping the engine above two-thirds of the
governed speed. When the engine speed
drops below two-thirds of the governed speed,
shift into the next lower gear before your engine
begins to lug. When you shift down, be sure
to double-clutch if required.
® ®
Eaton Fuller Nine and Ten-Speed
Non-Synchronized Manual
Transmissions
If your vehicle has one of these transmissions the
engine rpm and road speed must match when
upshifting and downshifting. The label above the
windshield will tell you the operating basics
you need to know.
The following are driving tips.
•
Always choose an initial starting gear suitable
for the load and terrain.
•
Always use double-clutching procedures
when shifting.
•
Never move the range shift lever to the
LO speed gear position after HI range
preselection, or anytime the transmission is in
the HI range.
•
Never move the range knob or lever with
the shift lever in NEUTRAL while the vehicle
is moving.
•
Never make a range shift while moving in
REVERSE (R).
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