Balancing Information
Torque is transmitted from the transmission to the axle through the
propeller shafts and universal joint assemblies. The number of propeller
shafts and universal joint assemblies vary with the vehicle wheel base. All
propeller shafts are the balanced tubular type.
There are two different methods for achieving balance within the propeller
shaft system during the manufacturing process. Vehicles that have one or two
propeller shafts have those shafts balanced individually. Vehicles that
have three propeller shafts utilize a system balance. System balance
is accomplished by effectively balancing the front, center, and rear
propeller shafts together on a special balancing machine. When manufactured,
the three-piece propeller shaft system and the transmission mounted parking
brake assembly are aligned with arrows painted on the shafts. In order
to ensure that these parts are assembled in proper relation to each other,
mark all components before disassembly. Minimizing driveline imbalance
in a three-piece propeller shaft system is critical for maintaining the
lowest vibrational noise possible. When servicing a three-piece propeller
shaft system, take special care that proper balance is maintained. In
the event that a single propeller shaft within a three-piece propeller
shaft system required replacement, follow one of the following procedures
in order to properly balance the three-piece propeller shaft system:
• | Consider replacement of all three propeller shafts in the system
by ordering the three-piece propeller shaft assembly |
• | Replace a damaged or worn propeller shaft (prebalanced as received)
and rebalance the remaining shafts individually or as a system |
• | Replace a damaged or worn propeller shaft (prebalanced
as received) and evaluate the resulting driveline. If necessary, correct remaining
propeller shaft imbalance by using procedures in Vibration Diagnosis
in General Information. |