Chevrolet Low Cab Forward 4500 2019 Series Owner's Manual page 151

150 Driving and Operating
Symptom
Poor steering wheel return
From the
transmission
Loud or abnormal
From differential
noises
From the
suspension
From the driveshaft
Cause
Poor lubrication in the
steering mechanisms
Poor wheel alignment
Insufficient
transmission oil
Transmission inner
components faulty
Insufficient differential
gear oil
Differential inner
components faulty
Spring pins, shackles,
or stoppers worn
Poor lubrication in each
component
Splines or bearings worn
Corrective Action
Lubricate the
mechanism
Add oil
Add oil
Lubricate them
Reference
-
-
See Automatic
Transmission Fluid
0 195
-
See Rear Axle
(Gear Oil Viscosity
Chart) 0 213 or
Rear Axle (Oil
Level Check) 0 214
-
-
See Owner Checks
and Services 0 280
-