Chrysler Full-Size Trucks 1967-1988 Repair Guide

Pinion Seal

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REMOVAL & INSTALLATION



Dana 60, Dana 70, and Dana F-375

See Figures 1, 2 and 3

A torque wrench capable of at least 300 ft. lbs. (406 Nm) is required for pinion seal installation.

  1. Raise and support the truck on jackstands.
  2.  
  3. Allow the axle to hang freely.
  4.  
  5. Matchmark, then disconnect the driveshaft from the front axle.
  6.  
  7. Using a holding tool, secure the pinion flange while removing the pinion nut.
  8.  
  9. Using a puller, remove the pinion flange.
  10.  
  11. Use a puller to remove the seal, or drive the seal out using a pin punch.
  12.  

To install:
  1. Thoroughly clean the seal bore and make sure that it is not damaged in any way. Coat the sealing edge of the new seal with a small amount of 80W/90 oil and drive the seal into the housing using a seal driver.
  2.  



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Fig. Fig. 1: Installing the pinion seal with special tool



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Fig. Fig. 2: Installing the pinion yoke

  1. Coat the inside of the pinion flange with clean 80W/90 oil and install the flange onto the pinion shaft.
  2.  
  3. Install the nut on the pinion shaft and tighten it to 250-300 ft. lbs. (338-406 Nm).
  4.  



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Fig. Fig. 3: Checking pinion preload

  1. Connect the driveshaft.
  2.  
  3. Carefully lower the vehicle and remove the jackstands.
  4.  

Dana 44

A torque wrench capable of at least 225 ft. lbs. (304 Nm) is required for pinion seal installation.

  1. Raise and safely support the vehicle with jackstands under the frame rails. Allow the axle to drop to the rebound position for working clearance.
  2.  
  3. Mark the companion flanges and U-joints for correct reinstallation position.
  4.  
  5. Remove the driveshaft use a suitable tool to hold the companion flange. Remove the pinion nut and companion flange.
  6.  
  7. Use a slide-hammer and hook or sheet metal screw to remove the oil seal.
  8.  

To install:
  1. Install a new pinion seal after lubricating the sealing surfaces.
  2.  
  3. Use a suitable seal driver. Install the companion flange and pinion nut.
  4.  
  5. Tighten the nut to 200-220 ft. lbs. (271-298 Nm).
  6.  

 
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