2018 CHEVROLET LOW CAB FORWARD automatic transmission

Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
11254764) - 2018 - crc - 12/5/16
230 Vehicle Care
For the crew cab vehicle, the
dipstick is located beneath the
rear-of-engine inspection panel.
After unlatching the A/T fluid
inspection cover, the dipstick will be
visible.
Inspection
Wait at least 30 minutes before
checking the transmission fluid if
you have been driving at high speed
for a long period of time, in city/
heavy traffic or while pulling a trailer.1. Start the engine, and drive the vehicle for approximately
10 minutes to warm up the
engine. During 10 minutes, the
automatic transmission fluid should reach a temperature of
approximately 70 - 80 °C
(158 - 176 °F). During the
winter when temperatures are
low, adjust the amount of
driving time according to the
actual conditions.
2. Park the vehicle on level ground, and firmly apply the
parking brake.
3. With the engine idling, move the selector lever from the “P”
position to the “1”position
while pressing the brake pedal,
and then return the lever from
the “1”position to the “P”
position.
4. With the engine still idling, pull out the dipstick and wipe it with
a clean cloth.Transmission Dipstick
5. Reinsert the dipstick into position, pull out the dipstick
slowly, and check whether the
fluid level is within the “H”
marked range. Always check
the fluid level at least twice.
Consistently is important in
maintaining accuracy.
If inconsistent readings persist,
check the transmission
breather to ensure that it is
clean and free of debris.
. Dipstick C (COLD) —
Transmission fluid
temperature Approx.
20 - 30 °C (68 - 86 °F).

Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
11254764) - 2018 - crc - 12/5/16
Vehicle Care 231
.Dipstick H (HOT) —
Transmission fluid
temperature Approx.
70 - 80 °C (158 - 176 °F).
. The “C (COLD)” range on
the dipstick is a guide used
by your dealer for
specialized equipment used
to replace or service the
automatic transmission
fluid. When performing your
own inspections, always
use the “H (HOT)” range
after warming up the
vehicle.
The fluid must be hot to
ensure an accurate check.
The fluid level rises as
temperature increases.
6. If the fluid level is too low, add the specified fluid through the
dipstick guide tube. Also, check
whether there are no fluid
leaks.
7. Insert the dipstick securely into position.{Warning
Be extremely careful not to burn
yourself when checking the oil
level if the engine temperature is
high. Protect yourself with
gloves etc.
You and others could be seriously
injured.
Discarded parts, oil, grease and
fluids could have an adverse effect
on the environment. It is difficult to
dispose of these, so have your
dealer handle all checks and
replacements.
Engine Air Cleaner/Filter
Air Cleaner
Use of clogged air cleaner element
not only causes a deterioration in
the engine output but also increased
fuel consumption and dark exhaust
smoke. Be sure to use a genuine air cleaner
element. If other air cleaner element
is used, it may cause the sensor to
output a wrong signal.
See
Maintenance Schedule 0303.
Air Cleaner Indicator Light
When the air cleaner indicator light
comes on, check the air cleaner
element. If the air cleaner element is
clogged, replace the air cleaner
element.
See Vehicle Messages 086.
See Maintenance Schedule 0303.
Engine Coolant
Protection of Engine Against
Overcooling
Overcooling of the engine not only
accelerates wear of the vital engine
parts but also hurts fuel economy.
Engine Coolant in Cold
Weather
To prevent the engine damage due
to freezing of the engine coolant,
mix the coolant and water at the
ratio of 50/50.

Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
11254764) - 2018 - crc - 12/5/16
Vehicle Care 251
Engine:
Removal or rendering engine speed
governor, if so equipped, inoperative
so as to allow engine speed to
exceed manufacturer specifications.
Fan and Drive:
.Removal of fan clutch or
rendering clutch inoperative.
. Removal of the fan shroud.
Air Intake:
. Removal of air cleaner silencer.
. Reversing air cleaner cover.
Exhaust:
. Removal of muffler, catalytic
converter, and/or resonator.
. Removal of exhaust pipes and
exhaust pipe clamps.
. Removal or modification of
diesel particulate filter (DPF).
. Removal or modification of
selective catalytic reduction
(SCR) catalyst.Automatic Transmission
Shift Lock Control
Function Check
When the Selector Lever
Cannot be Moved From the "P"
Position
Perform the following when the
selector lever cannot be moved from
the "P" position.
Caution
When the selector cannot be
operated from the P position to
any other position even after
performing the operation below
repeatedly, the shift lock system
may have a failure. Have the
vehicle inspected at your dealer.
When performing the below
operations, make sure the parking
brake is securely engaged. 1. Securely pull the parking brake lever and stop the engine.
2. Remove the cup holder (1) byremoving the three Torx®
bolts (2).

Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
11254764) - 2018 - crc - 12/5/16
Service and Maintenance 309
No. Service Interval16 000 km/10,000 mi
24 000 km/15,000 mi
32 000 km/20,000 mi
48 000 km/30,000 mi
64 000 km/40,000 mi
72 000 km/45,000 mi
80 000 km/50,000 mi
96 000 km/60,000 mi
112 000 km/70,000 mi
120 000 km/75,000 mi
128 000 km/80,000 mi
144 000 km/90,000 mi
160 000 km/100,000 mi
168 000 km/105,000 mi
176 000 km/110,000 mi
Service intervals
months or
kilometers
(miles)
whichever
occurs first (1)
22 Hydraulic brake booster
(HBB) fluid (5500HD
5500XD models) - - - R - - - R - - - R - - -
or every
24 months
23 Brake line and hoses - - I - I - - I - - I - I - I or every
12 months
24 Parking brake cable I - I I I - I I I - I I I - I or every
12 months
25 Automatic transmission
fluid
I - I R I - I R I - I R I - I or every
12 months
26 Differential gear oil I - I R I - I R I - I R I - I or every
24 months
27 Power steering fluid - - - R - - - R - - - R - - - or every
24 months
28 Power steering oil hoses - - - - - - R - - - - - R - - or every
24 months
29 Steering wheel free
play (4) Every 10 400 km (6,500 miles): I

Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
11254764) - 2018 - crc - 12/5/16
Service and Maintenance 315
20. Brake Electric Vacuum Pump
(4500HD, 4500XD models) :
Inspect the brake electric vacuum
pump operation every 16 000 km
(10,000 miles) or 12 months,
whichever occurs first.
21. Brake Fluid :Check the fluid in
the brake fluid reservoir every
16 000 km (10,000 miles). Replace
the fluid every 48 000 km
(30,000 miles).
22. Hydraulic Brake Booster Fluid
(5500HD, 5500XD models) :
Replace Dexron VI ATF fluid every
24 months or 30,000 miles
(48,000 km), whichever occurs first.
23. Brake Line and Hoses : Check
lines and hoses for proper hook-up,
binding, leaks, cracks, chafing, etc.
every 32 000 km (20,000 miles).
Any questionable parts should be
replaced or repaired at once. When
rubbing or wear is noted on lines or
hoses, the cause must be corrected
at once.
24. Parking Brake Cable : Check
the parking brake cable every
16 000 km (10,000 miles) or
12 months whichever occurs first. 25. Automatic Transmission
Fluid :
Check the automatic
transmission fluid level at each
engine oil change and replace fluid
every 48 000 km (30,000 miles). Do
not overfill.
26. Differential Gear Oil : Replace
lubricant every 48 000 km
(30,000 miles). Check lubricant level
every 16,000 km (10,000 miles) or
every 12 months, and add lubricant
to within 0 to 10 mm (0 to 0.4 inch)
of the bottom edge of the filler hole
if necessary.
27. Power Steering Fluid :
Replace power steering fluid every
24 months or 48 000 km
(30,000 miles), whichever occurs
first.
28. Power Steering Oil Hoses :
Replace power steering oil hoses
every 24 months or 80 000 km
(50,000 miles), whichever occurs
first.
29. Steering Wheel Free Play :
Check steering wheel free play after
the first 1 040 km (650 miles) and
then every 10 400 km (6,500 miles). Steering wheel free play
10-50 mm (0.39-1.97 in)
30. Steering Gear Box Torque :
Retighten the attaching bolts of the
steering gear box to the specified
torque every 12 months or every
32 000 km (20,000 miles) whichever
occurs first. Steering gear box tightening torque
103 Y(76 lb·ft)
31. Driveshaft Flange Torque :
Check the fixing bolts of driveshaft
flange for looseness or damage
after the first 16 000 km
(10,000 miles). Driveshaft flange tightening torque
103Y(76 lb·ft)
32. Driveshaft Lubrication :
Lubricate the grease fitting on the
center bearing, as well as each
universal joint and spline coupling
every 12 months or 16 000 km
(10,000 miles) whichever occurs
first.

Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
11254764) - 2018 - crc - 12/5/16
326 Service and Maintenance
Recommended Fluids, Lubricants, and Parts
Recommended Fluids and Lubricants
Fluids and lubricants identified below by name, part number, or specification can be obtained from your dealer.Usage Fluid/Lubricant
Automatic Transmission Automatic Transmission Fluid (GM Part No. 19354076).
Battery Terminals Petroleum Jelly (outer surfaces)
Brake Fluid DOT 3 Hydraulic Brake Fluid (GM Part No. 19299818).
Cab-Door Hinges and Latches
Lubricant Multi-Purpose Lubricant, Superlube (GM Part No. 12346241) or equivalent
containing zinc oxide.
Chassis Lubricant Chassis Lubricant (GM Part No. 12377985) or high temperature equivalent.
Diesel Exhaust Fluid (DEF) Diesel Exhaust Fluid (GM Part No. 19286291) or diesel exhaust fluid that meets ISO 22241-1 or displays the API Diesel Exhaust Fluid
Certification Mark.
Driveshaft Center Bearing, Wheel
Hub Bearing Lubricant NLGI #2 or #3
Driveshaft, Universal Joints and
Sliding Sleeve Lubricant NLGI #1 or #2 multi-purpose type grease
Engine Coolant 50/50 mixture of clean, drinkable water and GM extended life coolant. (GM Part No. 12378560) SeeEngine Coolant0231.

Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
11254764) - 2018 - crc - 12/5/16
Service and Maintenance 327
UsageFluid/Lubricant
Engine Oil Engine oils with the letters CK-4 are required for your vehicle. The CK-4
designation can appear either alone or in combination with other American
Petroleum Institute (API) designations, such as API CK-4/SL. These letters
show API levels of quality. To determine the preferred viscosity for your
vehicle's diesel engine, see Engine Oil0223.
Hydraulic Brake Booster (If
Equipped) DEXRON
®-VI Automatic Transmission Fluid.
Power Steerig Fluid DEXRON
®-VI Automatic Transmission Fluid.
Rear Axle Multi purpose gear oil SAE80W-90 GL-5, SAE90 GL-5
Rear Axle
(Limited slip differential (LSD)) Multi purpose gear oil SAE80W-90 GL-5, SAE90 GL-5 for limited slip
differential together with limited slip differential lubricant additive (GM
Part No. 88900330) or equivalent.
Windshield Washer Solvent Automotive windshield washer fluid that meets regional freeze protection requirements.

Chevrolet Low Cab Forward Owner Manual (GMNA-Localizing-U.S.-
11254764) - 2018 - crc - 12/5/16
336 Technical Data
Valve clearance (Between
cam and roller)Both intake and exhaust valves:
0.6 mm (0.024 in) in cold engine
Idling speed 500 - 600 r/min
Fan belt tension New belt: 5 - 7 mm (0.20 - 0.28 in)/184 - 206 Hz
When used: 8 - 9 mm (0.31 - 0.35 in)/158 - 170 Hz
Oil filter Cartridge
Engine oil capacity When changing oil and filter:
11.0 L (11.6 qt)
*1
Engine coolant capacity 19.6 L (20.7 qt)*2
Preheating system Glow plugs
Transmission Specifications
Model A465 Model Six-speed automatic transmission (overdrive gear for 5th and 6th), lock-up clutch for
2nd to 6th
Gear ratio 1st 3.742 to 1 2nd 2.003 to 13rd 1.343 to 1
4th 1.000 to 1
5th 0.773 to 1
6th 0.634 to 1
Reverse 3.539 to 1
Transmission oil capacity 13.1 L (27.7 pt)