RAM 2500 Truck 2WD V8-5.7L VIN D (2004)
Drive/Propeller Shaft: All Technical Service Bulletins
Drivetrain - Launch Shudder
NUMBER: 03-003-04
GROUP: Differential & Drive Line
DATE: June 15, 2004
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.
PARTS REQUIRED:
