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SUBJECT

DATE

Model 4 Single - Model 4 Rear Tandem Pinion Bearing Repair

February 2014

Additions, Revisions, or Updates
Publication Number / Title

Platform

Section Title

Change

DDC-SVC-MAN-0141

Detroit
Axles

Model 4 Single - Model 4
Rear Tandem Pinion
Bearing Repair

Removed reference to Loctite 277 and corresponding torque
spec,in step 29.

All information subject to change without notice.

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2 Model 4 Single – Model 4 Rear Tandem Pinion Bearing Repair

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Model 4 Single – Model 4 Rear Tandem Pinion Bearing Repair

Repair as follows:
1. Remove the input yoke nut and washer from the carrier.
2. Remove the carrier input yoke from the pinion.
3. Remove the ring gear. Refer to section "Rebuilding of the Differential".
4. Using a suitable press, push out the pinion.
NOTE: Pinion shims are located below the head bearing race.
5. Remove tail bearing.
6. Using a brass drift and hammer, remove the head bearing race (which is the one next to the ring gear), and tail bearing
races.
7. Clean all bearing race surfaces.
8. Install “c” dimension tool W420589001902 (1) and W4200589001901(2). Make sure they are flush against each other.

9. Install a dial indicator and measure the difference in the heights noted in images below. This difference will be used for
step 2 of the below calculation

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Table 1.
Model 4 FRT Pinion Bearing Calculation
1.

Tool Dimension (This is the height of the tool)

2.

Measured Difference

3.

Equals line 1 minus line 2

4.

Measured Bearing Height (Measurement provided in
parts kit)

5.

Equals line 3 minus line 4

6.

Standard Value (This value is constant and does not
change)

7.

Desired Shim Thickness (Equals line 5 minus line 6)

All information subject to change without notice.

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248.740 mm

196.500 mm

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2 Model 4 Single – Model 4 Rear Tandem Pinion Bearing Repair

10. Remove all tooling.
11. Using bearing driver W420589001504 along with W420589001502 and a suitable press (or hammer and drift), install a
new tail bearing race.

12. Install shim(s), there may be more than one shim being installed into the head bearing race cavity. If so, install race
using W420589001504 along with W420589001502.

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13. Using locally sourced bearing remover, remove old bearing from pinion gear.

14. Use bearing installer W420589001503, press new pinion head bearing into place.

All information subject to change without notice.

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2 Model 4 Single – Model 4 Rear Tandem Pinion Bearing Repair

15. Install pinion bearing spacer.

16. Install temporary shim (2.50 test shim is provided in the kit). Install onto pinion.

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17. Install pinion into carrier. It is necessary to support from the underside.

18. Using bearing installer W420589001503 and a suitable press, install the tail bearing onto pinion shaft.

All information subject to change without notice.

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2 Model 4 Single – Model 4 Rear Tandem Pinion Bearing Repair

19. Remove bearing installer.
20. Install counterholder.

21. Install yoke nut measuring device using a 56 mm (2 3/16 in.) 12 point socket; torque to 900 N·m (664 lb·ft).
22. Install push-pull arm.
23. Install dial indicator.

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24. Pull down on arm to check end play on pinion. Rotate the pinion several times in order to fully seat the pinion bearings
to get an accurate measurement. Example: Take the end play measurement and subtract that from the size of the shim
installed. Our shim was 2.36 mm (0.093 in.). Our end play 0.220 mm (0.0086 in.). For the calculation, subtract 0.05
mm (0.002 in.) – this is a standard value needed to calculate the preload 2.36 mm - 0.22 mm - 0.05 mm (0.093 in. –
0.0086 in. – 0.003 in.). Proper size of tail shim for preload is 2.09 mm (0.082 in.). Verify size of shim with micrometer.
25. Remove all special tools.
26. Using press, press the pinion back out of the carrier housing.
27. Remove test shim and then install the correct shim based on the measurement above.
28. Supporting pinion from below, guide pinion into housing. Install spacer, then shim onto pinion. Install upper bearing.
Using bearing installer tool W420589001503, press bearing back onto pinion shaft.

All information subject to change without notice.

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2 Model 4 Single – Model 4 Rear Tandem Pinion Bearing Repair

29. Install pinion nut and torque to 900 N·m (664 lb·ft). Check rotating torque, which should be between 7 and 25 N·m
(5.2 and 18.4 lb·ft). If OK, stake the pinion nut. If turning torque is too high, increase shim size. If turning torque is too
low, decrease shim size.
30. Reinstall the ring gear. Refer to section "Rebuilding of the Differential".
31. After ring gear installation, it is necessary to check pinion ring gear tooth contact pattern. Apply gear marking
compound to 4 to 6 teeth of the ring gear. Cover both the drive and coast side. Rotate the ring gear forward and
backward so pinion teeth have been fully engaged with paint marks on ring gear and a contact pattern can be observed.
See examples below.

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All information subject to change without notice.

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Table 2.
Good Tooth Contact Pattern

High Tooth Contact Pattern – increase pinion head shim size

Low Tooth Contact Pattern – decrease pinion head shim size

32. Using seal installer J-47369, install pinion yoke seal.
33. Install yoke and torque to 900 N·m (664 lb·ft).

All information subject to change without notice.

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