GMC 1999 Jimmy Owner's Manual page 260

When using wheel lift equipment to tow vehicles
equipped with the electronic shift transfer case, a towing
dolly must be placed under the rear wheels when towing
from the front and under the front wheels when towing
from the rear. When using wheel lift equipment to tow
vehicles equipped with the active transfer case, the
transfer case must be in NEUTRAL and the following
tow limits must be used:
D
Towing from the front
speed limit and distance is unlimited
D
--
Towing from the rear
50 miles (80 km)
5-8
--
55 mph (88 km/h) or legal
35 mph (55 km/h),
NOTICE:
If your vehicle is equipped with four
and the towing limits must be exceeded, a towing
dolly must be used under the front wheels or
vehicle/powertrain damage will occur.
Consult your dealer or a professional towing service if
you need to have your vehicle towed. See "Roadside
Assistance" in the Index.
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wheel drive