Jeep 2015 Wrangler - Owner Manual - Manual (Page 429)

Downshifting
Moving from a high gear down to a lower gear is
recommended to preserve brakes when driving down
steep hills. In addition, downshifting at the right time
provides better acceleration when you desire to resume
speed. Downshift progressively. Do not skip gears to
avoid overspeeding the engine and clutch.
WARNING!
Do not downshift for additional engine braking on a
slippery surface. The drive wheels could lose their
grip, and the vehicle could skid.
CAUTION!
• Skipping gears and downshifting into lower gears
at higher vehicle speeds can damage the engine
and clutch systems, Any attempt to shift into lower
gear with clutch pedal depressed may result dam-
age to the clutch system. Shifting into lower gear
and releasing the clutch may result in engine
damage.
• When descending a hill, be very careful to down-
shift one gear at a time to prevent overspeeding the
engine which can cause engine damage, and/or
clutch damage, even if the clutch pedal is pressed.
If transfer case is in low range the vehicle speeds to
cause engine and clutch damage are significantly
lower.
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