W350 1 Ton Pickup 4WD V8-360 5.9L VIN W 4-bbl (1983)
Slip Yoke: All Technical Service Bulletins
Driveline - Clunk or Snap
Models
1980-1986 Ramcharger 4-Wheel Drive W-150 Truck
Subject
Driveline "Clunk" or "Snap"
Index
PROP SHAFT & U JOINTS
Date
December 23,1985
No.
16-01-85
SYMPTOM/CONDITION
Customer concern for a "snap" or "clunk".
^
After medium-heavy brake application to a stop is completed.
^
When accelerating from a stop.
^
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 noise 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 in the slip yoke. At the end of the
stopping maneuver, the prop shaft would ordinarily slide smoothly back into the slip yoke. The characteristic "snap" occurs when the prop shaft
momentarily binds in the rearward position, then abruptly "snaps" forward to the neutral position.
PARTS REQUIRED
1
Boot Package
PN 4137901
REPAIR PROCEDURE
This repair consists of installing a boot package on the slip yoke.
1.
Raise vehicle.
2.
Remove rear driveshaft and slip yoke assembly.
3.
Remove slip yoke from driveshaft. Inspect the splines on the driveshaft and in the slip yoke for wear. Replace if excessive wear is observed.
4.
Remove and discard the slip yoke snap-on rubber seal.
5.
Thoroughly clean all old grease out of the slip yoke and driveshaft splines with a suitable solvent.
6.
After cleaning the slip yoke in solvent, clean the cup plug vent hole area with Mopar Brake and Carburetor Cleaner, PN 4318037. Seal the vent
hole with an epoxy (2 part) cement (Duro Depend II, PN MITB-1, or equivalent). Allow cure time as stated in the instructions.
7.
Remove the slip yoke grease fitting and install the 1/4"-28 pipe plug supplied in the kit.
8.
Apply and spread not more than half the supplied lubricant to the slip yoke splines and driveshaft (Excessive grease may fill the boot and the slip
