If You Do Decide To Pull A Trailer 
If you do, here  are some important points: 
0 
0 
0 
0 
There  are many different  laws, including speed limit 
restrictions, having  to 
do with trailering. Make  sure 
your rig  will  be legal, not only where  you live but 
also where you’ll be  driving. 
A good source for this 
information 
can be  state  or  provincial police. 
Consider using 
a sway control  if your trailer  will 
weigh less than 
the capacity  stamped on your  step 
bumper.  You should always  use a sway control 
if 
your trailer will weigh more than the capacity 
stamped 
on your  step bumper.  You can ask a hitch 
dealer  about sway controls. 
Don’t  tow a trailer at  all during the first 
500 miles 
(800 km) your  new vehicle  is  driven.  Your engine, 
axle  or  other parts  could be damaged. 
Then, during the  first 
500 miles (800 km) that you 
tow 
a trailer, don’t  drive over 50 mph (80 kdh)  and 
don’t make starts  at 
full throttle. This helps your 
engine  and other parts 
of your vehicle wear  in  at the 
heavier loads. 
0 If you  have an automatic transmission,  you can tow 
in  OVERDRIVE 
(a). You may  want to shift the 
transmission to 
THIRD (3) or,  if necessary, a lower 
gear selection  if the  transmission shifts  too often 
(e.g., under  heavy loads and/or 
hilly conditions).  If 
you  have 
a manual transmission and  you are towing 
a  trailer,  it’s better  not to use 
FIFTH (5) gear. Just 
drive 
in FOURTH (4) gear  (or, as you  need  to, a 
lower gear). 
Three important considerations have 
to do  with  weight: 
0 the weight of the trailer, 
0 the weight  of the trailer tongue 
0 and  the weight on your vehicle’s tires. 
Weigl- - 3e Trailer 
How  heavy  can a trailer safely  be? 
It  depends 
on how  you  plan to use your rig. For 
example,  speed, altitude,  road grades,  outside 
temperature and  how  much your vehicle is  used to 
pull a 
trailer  are all important. And, 
it can also depend on any 
special equipment that  you have 
on your vehicle. 
4-50 
ProCarManuals.com 
Rear Axle 
When to Check  and  Change  Lubricant 
Refer to the Maintenance Schedule  to  determine how 
often to check 
the lubricant and when  to change it.  See 
“Scheduled Maintenance Services”  in the Index. 
How to  Check  Lubricant 
If the level  is  below the bottom  of  the filler plug hole, 
you’ll  need to add some lubricant. 
Add enough lubricant 
to raise the  level  to the bottom 
of the filler plug hole. 
What to Use 
Refer to the Maintenance Schedule  to determine what 
kind  of lubricant 
to use. See  “Recommended Fluids and 
Lubricants” 
in the Index. 
C3 (3500 HD) Trucks  Equipped  with  Dana 
Rear 
Axle 
Additional rear  axle scheduled maintenance is required 
on 
3500 HD models equipped with Dana rear axles 
when  they are driven under the following conditions: 
Extreme loading (at  or near GVWR)  or trailer 
Operation above 45 mph (70 km/h) for extended 
Vehicles  used in any  of these  conditions  require the 
rear  axle  lubricant  be changed every 
30,000 miles 
(50 000 km). Fluid capacity  is 4.12  quarts (3.9 L). 
towing,  and: 
periods  of time. 
Four-wheel Drive 
Most lubricant checks in this section also apply to 
four-wheel-drive  vehicles. However,  they have two 
additional systems that  need lubrication. 
6-26 
ProCarManuals.com