Driveline - Clunk or Snap on Acceleration or Braking

84chrysler5

Models


1981-1984 D100, 150, 200, 250, Two-Wheel Drive Pick-Up Truck, B 100, 150, 200, 250, Ram Vans, Wagons & Voyagers


Subject


Driveline "Clunk" or "Snap"


Index

PROP SHAFT & U JOINTS

Date


11/12/84

No..


16-01-84

P-5035C
This bulletin supersedes and cancels Technical Service Bulletin #16- 02-83, which should be removed from your files. This bulletin eliminates the need to replace the complete driveshaft assembly in two wheel drive trucks are described in Technical Service Bulletin #16-02-83. Four wheel drive models will be addressed in a future bulletin.

SYMPTOM/CONDITION

Customer concern for a "snap" or "clunk" after medium-heavy brake application to a stop is completed or when accelerating from a stop. The noise may also be heard at the 1-2 upshift.

DIAGNOSIS

Description of Condition

Drive line "snap" is a single snap or clunk noise sometimes heard when braking to a forward stop or accelerating from a stop. It is ordinarily heard just as a stop is completed, when the vehicle transitions from the nose-down braking attitude to the level-stationary attitude. It may also be heard just as motion begins on acceleration or at the 1-2 upshift.

Forward direction braking causes the rear axle pinion nose to pitch downward from brake torque reaction. The vehicle also assumes an overall nose-down attitude. The combination of these motions results in maximum rearward excursion of the prop shaft slip yoke in the transmission extension. At the end of the stopping maneuver, the slip yoke would ordinarily slide smoothly back into the extension. The characteristic "snap" occurs when the slip yoke momentarily binds in the rearward position, then abruptly "snaps" forward to the neutral position.
PARTS REQUIRED

Vehicles equipped with A904/999 transmission:

1 - Yoke (nickel plated) PN 4137452

Vehicles equipped with A727 transmission:

1 - Yoke (nickel plated) PN 4137456

REPAIR PROCEDURE

1. Raise vehicle.

2. Remove driveshaft.

3. Remove slip yoke.

4. Install nickel plated slip yoke on driveshaft.

5. Lubricate splines with automatic transmission fluid.

6. Reinstall driveshaft.

7. Lower vehicle and road test.


POLICY: Reimbursable within the provisions of the warranty


TIME ALLOWANCE:
Labor Operation No. 16-30-10-01................................ 0.6 Hrs.
Refer to Labor Operation Time Schedule


FAILURE CODE: 52 - Improperly Machined