Chrysler Full-Size Trucks 1967-1988 Repair Guide

Rear Driveshafts and U-Joints

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REMOVAL & INSTALLATION



See Figure 1

Ball and Trunnion Type
  1. Raise the vehicle and support it on jackstands.
  2.  
  3. Matchmark the U-joint and pinion flange to ensure proper installation. Remove both rear U-joint roller and bearing assembly clamps from the pinion yoke. Do not disturb the retaining clamp used to hold the roller assemblies in place.
  4.  
  5. Disconnect the front U-joint from the transmission flange and remove the shaft from the vehicle.
  6.  

To install:
  1. Before installing the driveshaft, wipe the areas with a clean cloth and inspect the surfaces for scratches, nicks, dents or burrs. If there are any of these correct the problem before proceeding.
  2.  
  3. If necessary replace the seal.
  4.  
  5. Replace the shaft on the vehicle, and connect the front U-joint at the transmission flange.
  6.  
  7. With the matchmarks on the U-joint and pinion flanges in position, install both rear U-joint roller and bearing assembly clamps at the pinion yoke.
  8.  
  9. Lower the truck.
  10.  

Cross and Roller Type
1967-69 MODELS
  1. Raise and support the vehicle. Matchmark the U-joints and sliding yokes.
  2.  
  3. Remove the U-joint at the rear axle by removing the two strap bolts and straps.
  4.  
  5. Remove the two bushing and roller assemblies.
  6.  
  7. Remove the front U-joint in the same manner by removing the strap bolts and straps.
  8.  
  9. Remove the driveshaft from the vehicle.
  10.  

To install:
  1. Before installing the driveshaft, wipe the areas with a clean cloth and inspect the surfaces for scratches, nicks, dents or burrs. If there are any of these correct the problem before proceeding.
  2.  
  3. If necessary replace the seal.
  4.  
  5. Installation is the reverse of removal. Make sure to replace parts with the matchmarks made earlier. Coat the bushing rollers with short fiber grease and tap the bushings into the yoke on the cross bearing journals.
  6.  

1970-88 ONE-PIECE SHAFT
  1. Raise and support the truck.
  2.  
  3. Matchmark the shaft and pinion flange to assure proper balance at installation.
  4.  
  5. Remove both rear U-joint roller and bushing clamps from the rear axle pinion flange. Do not disturb the retaining strap that holds the bushing assemblies on the U-Joint cross.
  6.  

Do not allow the driveshaft to hang during removal. Suspend it from the frame with a piece of wire. Before removing the driveshaft, lower the front end to prevent loss of fluid.

  1. Slide the driveshaft from the truck.
  2.  

To install:
  1. Before installing the driveshaft, wipe the are with a clean cloth and inspect the surfaces for scratches, nicks, dents or burrs. If there are any of these correct the problem before proceeding.
  2.  
  3. Engage the yoke splines on end of the output shaft, be careful not to burr the splines.
  4.  
  5. Install the rear U-joint with roller bushings and seats of the drive pinion hub yoke, aligning the marks made during removal.
  6.  
  7. Install the bushing clamps and attaching screws. Tighten the 1 / 4 -28 clamp screws to 19 ft. lbs. (26 Nm) and 5 / 16 -24 clamp screws to 34 ft. lbs. (34 Nm).
  8.  

1970-88 TWO-PIECE SHAFT

This driveshaft has a universal joint at either end, with a third universal joint and a support bearing at the center.

  1. Matchmark the shaft and the rear axle pinion hub yoke. Matchmark the center support bearing spline and slip yoke.
  2.  

Do not allow the driveshaft to hang down during removal. Suspend it from the frame. Raise the rear of the truck to prevent loss of transmission fluid.

  1. Remove both rear U-joint roller and bushing assembly clamps from the rear axle pinion yoke. Do not disturb the retaining strap used to hold the bushing assemblies on the U-joint cross.
  2.  
  3. Slide the rear half of the shaft off the front shaft splines at the center bearing. Remove the rear half.
  4.  
  5. At the transmission end of the front half, remove the bushing retaining bolts and clamps, after matchmarking. If there is a driveshaft brake, there will be flange nuts.
  6.  
  7. Unbolt the center support bearing mounting nuts and bolts, then remove the front half of the shaft.
  8.  

To install:
  1. Align the matchmarks at the transmission, then start all the bolts and nuts at the front U-joint and at the center support bearing.
  2.  
  3. Tighten 1 / 4 in. (6.3mm) clamp bolts to 19 ft. lbs. (26 Nm) and 5 / 16 in. (8mm) bolts to 34 ft. lbs. (33 Nm). Tighten driveshaft brake flange nuts to 35 ft. lbs. (47 Nm). Leave the center bearing bolts just snug.
  4.  
  5. Align the rear shaft matchmarks and slide the yoke onto the front shaft spline.
  6.  
  7. Align the rear U-joint matchmarks and install the bushing clamps and bolts. Tighten the bolts to repeat retorque specs here.
  8.  



Click image to see an enlarged view

Fig. Fig. 1: Driveshaft alignment

  1. Grease the joints and splines.
  2.  
  3. Jack up the rear wheels and drive the propeller shaft with the engine. The center support bearing will align itself.
  4.  
  5. Tighten the center support bearing bolts to 50 ft. lbs. (68 Nm).
  6.  

U-JOINT OVERHAUL



Ball and Trunnion Type
  1. Remove the driveshaft.
  2.  
  3. Straighten the tabs on the grease cover and remove the grease cover, then gasket.
  4.  
  5. Push the body back and remove the components from both ends of the trunnion pin.
  6.  
  7. Remove the clamps and loosen the dust cover. Remove and save the breather located between the driveshaft and rear end of the cover.
  8.  
  9. Clean and examine the trunnion pin for wear. If wear in the body is noticeable, it should be replaced. A press is necessary to remove the pin.
  10.  
  11. Clean all parts in kerosene or a similar solvent.
  12.  
  13. When the trunnion pin and body have not been replaced, a new boot can be installed after coating all parts with U-joint grease. Stretch the boot over the pin and work it through the body into position on the shaft.
  14.  
  15. If removed the trunnion pin must be pressed into the driveshaft with a hydraulic press.
  16.  
  17. Install a thrust washer the rollers, ball, button spring, and thrust button on each end of the trunnion pin, then position the body over the pin.
  18.  
  19. Install the boot on the driveshaft with the breather parallel to the shaft. Install the clamp.
  20.  
  21. Position the boot on the U-joint body and install the retaining clamp.
  22.  
  23. Lubricate the U-joint with 2 oz. of U-joint grease applied evenly in both races.
  24.  
  25. Install the gasket on the cover, then install the cover on the body. Bend the tabs to retain the cover.
  26.  
  27. Install the driveshaft and U-joint assembly.
  28.  

Lockring and Snapring Type

See Figure 2

  1. Hammer the bushings (roller caps) slightly inward to relieve pressure on the retainers. Remove the retainers.
  2.  
  3. Place the yoke in a vice with a socket bigger than the bushing on one side and one smaller than the bushing on the other side.
  4.  



Click image to see an enlarged view

Fig. Fig. 2: Sliding yoke with snapring type U-joint

  1. Apply pressure, forcing one bushing out into the larger socket.
  2.  
  3. Reverse the vise and socket arrangement to remove the other bushing and the cross.
  4.  
  5. On installation, press the new bushings in just far enough to install the retainers.
  6.  

Strap Clamp Type (Rear Axle Yoke)
  1. Unthread the strap bolts and remove straps, bushings, seals and washer retainers.
  2.  
  3. Install new components as required.
  4.  
  5. Grease bearings when assembling. Install with grease fitting parallel to other fittings in the drive train.
  6.  
  7. Tighten strap bolts to 20 ft. lbs. (27 Nm).
  8.  

Constant Velocity U-Joint

The constant velocity U-joint is the double universal joint used in the front driveshaft on four-wheel drive models. It can be are disassembled in the same way as the snapring type U-joint. Original equipment U-joints are held together by plastic retainers which shear when they are pressed out. The bearing cups in the center part of the joint should be pressed out before those in the yoke. Original equipment constant velocity joints cannot be re-assembled. Replacement part kits should have the bearing cups with grooves for retaining rings.

Slip Joints

When re-assembling slip joints, make sure that arrows stamped on each side are matched. This will assure proper universal joint alignment.

 
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