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TSB 16-01-94

Shudder Pulling Away From Stop When Operated Near Maximum GVW Rating

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Date: Oct. 14, 1994

Models: 1994 - 1995 (BR) Ram Pickup

NOTE: THIS BULLETIN APPLIES TO 1500, 2500 & 3500 SERIES VEHICLES EQUIPPED WITH A TWO PIECE REAR DRIVESHAFT AND OPERATED NEAR MAXIMUM GROSS VEHICLE WEIGHT (GVW).

NOTE:
For 1500 4X2 QC SB, AT - this TSB has been superseded by TSB 03-04-96
For 2500 4X2 QC SB, AT - this TSB has been superseded by TSB 03-05-96
For 2500 & 3500 Reg Cab AT - this TSB has been superseded by TSB 03-02-96.

Symptoms:

The vehicle may exhibit a driveline shudder while pulling away from a stop.  

Discussion:

Launch shudder may be due to undesirable driveline angles when the vehicle is used at or near its maximum GVW rating.

As the vehicle is loaded, the driveline angle will change. In the case of maximum GVW, the rear differential may rise above the rear driveshaft center bearing when the vehicle is launched. The resulting driveline alignment could cause a shudder in the driveline.

If the vehicle is routinely operated at or near GVW, the following repair procedure will change the driveline angle of the vehicle to minimize driveline shudder.

NOTE: IF THE REPAIR PROCEDURE IS PERFORMED, SOME DRIVELINE SHUDDER WILL BE EXPERIENCED WHILE PULLING FROM A STOP WHEN THE VEHICLE IS OPERATED UNLOADED OR NEAR VEHICLE CURB WEIGHT. THIS SHUDDER WOULD BE OF MINIMUM INTENSITY AND SHORT IN ITS DURATION.

Though the addition of auxiliary leaf springs nay be a possible alternative for the owner, modifications to the vehicle rear leaf springs to meet individual preferences are the responsibility of the vehicle owner.

Minimizing U-joint angle will normally improve a shudder condition. For this reason, the part numbers of other shims have been added to this bulletin. This will allow for the adjustment of the center support bracket and the rear differential angle. Do not exceed an axle wedge greater than 2 degrees due to the length of the axle-to-spring locating pins.

Maintaining a U-joint angle of no less than 1/2 degree and no more than 3 degrees is usually desirable. Because U-joint angles change depending upon the amount of weight applied to the vehicle bed, U-joint angle readings may need to be taken with different vehicle loads in order to obtain a satisfactory compromise

 

Parts Required: 

1            52098088    Single piece driveshaft
1            4778846      Bracket, Center bearing support (7290 series 9.25" axle) (Type 1)
1            4778846      Bracket, Center bearing support (1410 series Dana axle) (Type 2)
4            J0427571     Bolt, Bracket-to-bed (7/16 x 2 in.)
1            4796836      Shims, Trans. Mount-to-Crossmember (7/16 in.)
AR   1    4778851      Shims, Trans. Mount-to-Bracket (1/8 in.)
AR   1    4778852      Shims, Trans. Mount-to-Bracket (1/4 in.)
AR   1    4778853      Shims, Trans. Mount-to-Bracket (1/2 in.)
AR   1    4746012      Shim Package, Rear Axle Wedges

Repair Procedure: 

This bulletin involves the replacement of the driveshaft or the driveshaft center support bearing bracket.

1.    Inspect the two-piece driveshaft for a part number.

2.    If the driveshaft part number is 53006759, replace the driveshaft with the single piece driveshaft, P/N 52098088. Tighten the strap bolts to: Dana Axle - 22 ft. lbs. or 9-1/4 axle 14 ft. lbs.

3.    If the driveshaft part number is other than 53006759, replace the driveshaft center support bearing bracket. Tighten bracket bolts to 50 ft. lbs. torque (Figure 1). Use bracket, P/N 4778846 (Type 1), for a vehicle equipped with a 9-1/4 rear axle. Use bracket, P/N 4778850 (Type 2), for all vehicles equipped with a Dana 60, 70 or 80 rear axle.

4.    Install a 7/16 in. shim, P/N 4796836, between the rear support cushion and crossmember (Figure 2).

5.    Measure and adjust driveline angle as necessary.

Notes: 

Policy:    Reimbursable within the provisions of the warranty.

Time Allowance:
Labor Operation No:  16-50-10-90 Check and Adjust U/Joint Angle . 0.5 Hrs.
                                   16-30-01-90 Propeller Shaft - Replace Includes Install Shins 0. 5 Hrs.
                                    16-10-01-90 Bracket, Center Bearing Support - Replace Includes Install Shins . 0.4 Hrs.

Failure Code:  P8 - New Part 


Thanks to Bob Bergevin and Barry Drodge for supplying this TSB information

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This page was edited on: May 3, 2004