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TSB 03-02-93

Launch Shudder/Vibration

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Date: May 7, 1993

Models: 1992 - 1993 (AD) Ram Pickup/Ram Cab Chassis

Symptom/Condition:

Some vehicles may exhibit a shudder evident with medium to heavy throttle which will be present through the 1-2 shift. Some 131 inch wheelbase vehicles may also exhibit a drive line vibration under load. If either condition is encountered, perform the repair procedure.  

Parts Required:

1    Shim and Spacer Package    4746012  

Repair Procedure:

This bulletin involves adding a spacer to lower the center propeller bearing on the 149 inch wheel base vehicles and adjusting the pinion angle of the rear axle.

NOTE: THE 149 INCH WHEEL BASE VEHICLE IS EQUIPPED WITH A TWO PIECE PROPELLER SHAFT. THIS VEHICLE REQUIRES A 1/2 INCH SPACER TO LOWER THE CENTER SUPPORT BEARING. THE 131 INCH WHEEL BASE VEHICLE ONLY REQUIRES ADJUSTMENT TO THE PINION ANGLE.  

1.    On 149 inch wheel base vehicles, install the 1/2 inch spacer between the center support bearing bracket and the crossmember. Tighten the bolts to 68 N-m (50 Ft. lb.)

2.    For both 131 and 149 inch wheel base vehicles use the inclinometer (tool no. 7663). Measure the rear axle pinion angle with the weight of the vehicle on the wheels or axles (see figure below). The vehicle should be at curb weight (unloaded). Measure the frame angle using the inclinometer. The pinion angle should be 5.8 degrees plus or minus 1/2 degree, higher than the frame. (Example: if the frame angle is 3 degrees, the pinion angle should be 8.8 degrees plus or minus 1/2 degree.) If the pinion angle is not correct, select the tapered axle shim which will bring the pinion angle into the specified range. Install the shims between the spring pad on the axle and the leaf spring. The tapered axle shims in the package are provided in 1/2, 1, 2 and 3 degree pairs. Two shims can be combined to obtain 1/2 degree increments.

Notes:

POLICY: Reimbursable within the provisions of the warranty.

TIME ALLOWANCE:
Labor Operation No. 131 inch Wheel Base 16-30-90-90 . . . . . . . . 0.8 Hrs.
                                 149 Inch Wheel Base 16-30-90-91 . . . . . . . . 0.9 Hrs.

FAILURE CODE: 2X - Vibration


Thanks to Barry Drodge for supplying the TSB information

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This page was edited on: May 3, 2004