TSB Number:
03-003-04
SUBJECT:
Launch Shudder
OVERVIEW:
This bulletin involves adjusting the propeller shaft working angles.
MODELS:
2003 - 2004 (DR) Ram Truck
NOTE: This bulletin applies to vehicles equipped with a two piece rear driveshaft.
SYMPTOM/CONDITION:
A vehicle may exhibit a drive line shudder or vibrations while accelerating from a stop. The
condition is most noticeable under heavy throttle acceleration and is usually only present a
low speeds (below 25 m. p. h. ).
DIAGNOSIS:
Vehicles equipped with a two piece driveshaft are designed to minimize reaction forces
which result from the universal joint transmitting torque at an angle. These forces can not
be eliminated entirely because of the necessity to compromise joint angle selection
between curb and design loading conditions. When subjected to this vibration, the vehicle
experiences a shudder type disturbance, generally occurring less than 25 mph. This
disturbance will increase as the suspension moves further from its design load (typically
two front passengers). The forces are also torque sensitive, which means the disturbance,
will be highest under wide open throttle.
U-joint angles change depending upon the amount of weight applied to the vehicle bed,
therefore u-joint angle readings may need to be taken with different vehicle loads in order
to obtain a satisfactory compromise. The vehicle should be evaluated under the loaded
condition that produces the objectionable disturbance.
Attention: TDR Forum Junkies 
