Jeep CJ 1945-1970 Repair Information

U-Joints

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Most Jeep vehicles use a conventional universal joint at both ends of both driveshafts. Universal joints are held together by snaprings on the outside of the bearing caps.

On 1945-70 vehicles, 3 types of front axle U-joints were used; the Bendix type and the Rzeppa type, used on Axle models 25 and 27, and the more familiar single cross Cardan type used on axle model 27AF.

OVERHAUL



Single Cross Cardan Type
  1. Remove the snaprings by pinching the ends together with a pair of pliers. If the rings do not readily snap out of the groove, tap the end of the bearing lightly to relieve pressure against the rings.
  2.  
  3. After removing the snaprings, press on the end of one bearing until the opposite bearing is pushed from the yoke arm. Turn the joint over and press the first bearing back out of that arm by pressing on the exposed end of the journal shaft. To drive it out, use a soft drift with a flat face, about 1 / 32 in. (0.794mm) smaller in diameter than the hole in the yoke; otherwise there is danger of damaging the bearing.
  4.  
  5. Repeat the procedure for the other two bearings, then lift out the journal assembly by sliding it to one side.
  6.  
  7. Wash all parts in cleaning solvent and inspect the parts after cleaning. Replace the journal assembly if it is worn extensively. Make sure that the grease channel in each journal trunnion is open.
  8.  
  9. Pack all of the bearing caps 1 / 3 full of grease and install the rollers (bearings).
  10.  
  11. Press one of the cap/bearing assemblies into one of the yoke arms just far enough so that the cap will remain in position.
  12.  
  13. Place the journal in position in the installed cap, with a cap/bearing assembly placed on the opposite end.
  14.  
  15. Position the free cap so that when it is driven from the opposite end it will be inserted into the opening of the yoke. Repeat this operation for the other two bearings.
  16.  
  17. Install the retaining clips. If the U-joint binds when it is assembled, tap the arms of the yoke slightly to relieve any pressure on the bearings at the end of the journal.
  18.  

Bendix Type

See Figure 1

With ordinary shop equipment it is nearly impossible to satisfactorily rebuild this unit. For this reason, the factory no longer supplies parts. After considerable mileage, a joint may pull apart upon removal from the vehicle. This does not mean that the joint is no longer usable. To assemble the axle shaft and universal:

  1. Place the differential half of the shaft in a vise with the ground portion above the jaws.
  2.  
  3. Install the center ball (the one with the drilled hole) in the socket in the shaft, with the hole and groove visible.
  4.  
  5. Drop the center ball pin into the drilled hole in the wheel half of the shaft.
  6.  
  7. Place the wheel half of the shaft on the center ball. Slip the three balls into the races.
  8.  
  9. Turn the center ball until the groove lines up with the race for the remaining ball. Slip the ball into the race and straighten the wheel end of the shaft.
  10.  
  11. Turn the center ball until the pin drops into the hole in the ball.
  12.  
  13. Install the lock pin and center punch both ends to secure it.
  14.  



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Fig. Fig. 1: Identification of the components which comprise a Bendix type front axle U-joint

Rzeppa Type

See Figures 2, 3 and 4

With the joint removed, determine the method of attachment of the axle to the joint. If 3 bolts are used, start the procedure with Step 1; if there are no mounting bolts, skip Step 1 and proceed to Step 2.

  1. Remove the three bolts securing the front axle to the joint. Pull the shaft free of the splined inner race. Remove the retaining ring and remove the axle shaft retainer.
  2.  
  3. To remove the axle shaft from the joint, use a wooden pry, and exert force in the direction of the axis of the axle shaft. Use a mallet, if necessary, to exert enough force to drive the retaining ring, installed on the end of the shaft, into its groove in the spline, permitting the joint to be slipped off the shaft.
  4.  
  5. Push down on various points of the inner race and cage until the balls can be removed with the help of a small prytool.
  6.  
  7. There are two large rectangular holes in the cage as well as four small holes. Turn the cage so that the two bosses in the spindle shaft will drop onto the rectangular holes and lift out the cage.
  8.  
  9. To remove the inner race, turn it so that one of the bosses will drop into a rectangular hole in its cage and shift the race to one side. Lift it out.
  10.  
  11. Assembly is the reverse of disassembly. Take care to keep all parts as clean as possible.
  12.  



Click image to see an enlarged view

Fig. Fig. 2: Identification of the components which comprise a Rzeppa type front axle U-joint



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Fig. Fig. 3: Use a small prytool to remove the balls from the U-joint cage



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Fig. Fig. 4: Once all of the balls are removed, turn the cage 90 degrees from its normal resting position and pull it out of the joint housing

See Figure 5



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Fig. Fig. 5: DRIVELINE NOISE DIAGNOSIS

 
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