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Home >> Ford >> 2012 >> Mustang Boss 302 >> Repair and Diagnosis >> External Pages >> Different car >> Section 50 (Rear Drive Axle/Differential - Ford 10.50-Inch Ring Gear -- F250-F350 Super Duty) >> In-Vehicle Repair >> Differential Bearings >> Installation

Differential Bearings: Installation

WARNING: This page is about a different car, the 2012 Ford Pickup and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the inner and outer bearing cups.
    1. After placing the inner and outer bearing cups in their bores, place the Input Shaft Bearing Cup Installer on the inner pinion bearing cup.
    2. Place the Drive Pinion Bearing Installer on the outer pinion bearing cup.
    3. Install the Rear Axle Drawbar into the replacer tools.
    Fig 1: Identifying Drive Pinion Bearing Installer On Outer Pinion Bearing Cup
    G06777089Courtesy of FORD MOTOR CO.
  2. Tighten the Rear Axle Drawbar to install the pinion bearing cups into their bores.
    Fig 2: Locating Pinion Bearing Cups
    G06777090Courtesy of FORD MOTOR CO.
  3. Make sure the cups are correctly seated in their bores.
    • If a feeler gauge of the specification shown in the illustration can be inserted between a cup and the bottom of its bore at any point around the cup, the cup is not correctly seated.
    Fig 3: Checking Drive Pinion Bearing Cup Installation Position Using Feeler Gauge
    G06166784Courtesy of FORD MOTOR CO.
    4. NOTE: Install new drive pinion bearings without any additional lubricant since the anti-rust oil provides adequate lubricant without upsetting the drive pinion bearing preload settings.
    Fig 4: Identifying Adapter, Drive Pinion Depth Gauge, Gauge Block Adapter, Gauge Tube And Pinion Depth Gauge
    G06777092Courtesy of FORD MOTOR CO.
  4. Assemble and position the Adapter, Drive Pinion Depth Gauge, Gauge Block Adapter, Gauge Tube and Pinion Depth Gauge.
    Item Part Number Description
    1 4621 Pinion bearing (outer)
    2 205-160 Adapter (T80T-4020-F43)
    3 4630 Pinion bearing (inner)
    4 205-423 Drive Pinion Depth Gauge
    5 205-159 Gauge Block Adapter (2.1993-inch thick) (T80T-4020-F42)
    6 205-D038 Gauge Tube (4.126-inch OD) (D81T-4020-F51)
    7 205-937 Drive Pinion Depth Gauge/Aligner
    8 4010 Rear axle housing
    9 205-111 Handle (T76P-4020-A11)
    5. NOTE: This step duplicates final pinion bearing preload.
    Fig 5: Checking Differential Pinion Bearing Preload
    G06125144Courtesy of FORD MOTOR CO.
  5. Tighten the Adapter to achieve the pinion bearing preload.
    • Tighten to 2.2 Nm (20 lb-in).
    6. NOTE: The Adapter must be offset to obtain an accurate reading.
    Fig 6: Identifying Adapter Position
    G06125145Courtesy of FORD MOTOR CO.
  6. Rotate the Adapter several half-turns to make sure of correct seating of the pinion bearings, and position the Adapter.
  7. Install the Gauge Tube.
    1. Position the Gauge Tube.
    2. Install the 2 differential bearing caps.
    3. Install the 4 differential bearing cap bolts.
      • Tighten to 118 Nm (87 lb-ft).
    Fig 7: Installing Differential Side Bearing Caps And Bolts
    G06777095Courtesy of FORD MOTOR CO.
    8. NOTE: Drive pinion bearing adjustment shims must be flat and clean.
    NOTE: A slight drag should be felt for correct shim selection. Do not attempt to force the pinion shim between the gauge block and the gauge tube.
    Fig 8: Checking Pinion Bearing Adjustment Shim
    G06142851Courtesy of FORD MOTOR CO.
  8. Use a drive pinion bearing adjustment shim as a gauge for shim selection.
    9. NOTE: Check the splines on the pinion stem to be sure they are free of burrs. If burrs are evident, remove them by using a fine crocus cloth. Working in a rotational motion, wipe the pinion clean.
    NOTE: The same differential pinion bearing used in the previous procedure must be used in the final assembly of the axle.
    Fig 9: Installing Pinion Bearing
    G06777097Courtesy of FORD MOTOR CO.
  9. Place the selected shim on the pinion and press the bearing until it is firmly seated on the shaft using the Bearing/Oil Seal Plate and Drive Pinion Bearing Installer.
  10. Place a new collapsible spacer on the pinion shaft against the pinion stem shoulder.
    Fig 10: Identifying Drive Pinion Collapsible Spacer
    G06125150Courtesy of FORD MOTOR CO.
  11. Install the outer drive pinion bearing and drive pinion shaft oil slinger.
    Fig 11: Locating Outer Drive Pinion Bearing And Drive Pinion Shaft Oil Slinger
    G06125151Courtesy of FORD MOTOR CO.
  12. Lubricate the new drive pinion seal lips with grease.
  13. Using the Drive Pinion Oil Seal Installer, install the drive pinion oil seal.
    Fig 12: Installing Drive Pinion Oil Seal
    G07478429Courtesy of FORD MOTOR CO.
  14. Install the drive pinion in the drive pinion carrier bore from inside the rear axle housing.
    Fig 13: Installing Drive Pinion In Drive Pinion Carrier Bore From Inside Rear Axle Housing
    G06125222Courtesy of FORD MOTOR CO.
  15. Align the pinion and pinion flange alignment marks.
    Fig 14: Identifying Mark Pinion Flange
    G06777006Courtesy of FORD MOTOR CO.
    16. NOTE: The Drive Pinion Flange Installer must be used due to tight spline fit.
    Fig 15: Installing Pinion Flange
    G07478431Courtesy of FORD MOTOR CO.
  16. With the drive pinion in place in the axle housing, install the pinion flange using the Drive Pinion Flange Holding Fixture and Drive Pinion Flange Installer.
  17. Position the new pinion nut.
    Fig 16: Locating Pinion Nut And Washer
    G06777103Courtesy of FORD MOTOR CO.
    18. NOTE: Do not loosen the pinion nut to reduce drive pinion bearing preload. Install a new drive pinion collapsible spacer and pinion nut if drive pinion bearing preload reduction is necessary. If a new collapsible spacer must be installed for pinion bearing preload reduction, install the nut supplied with the new spacer kit or damage to the component may occur.
    Fig 17: Removing Pinion Nut
    G06777005Courtesy of FORD MOTOR CO.
    Fig 18: Locating Pinion Nut
    G07478432Courtesy of FORD MOTOR CO.
  18. Using the Drive Pinion Flange Holding Fixture to hold the pinion flange, tighten the pinion nut to set the drive pinion bearing preload.
    • Tighten the pinion nut, rotating the pinion occasionally to make sure the drive pinion bearings are seating correctly. Take frequent drive pinion bearing preload readings by rotating the drive pinion gear with a Nm (lb-in) torque wrench. The final readings must be 0.56 Nm (5 lb-in) more than the initial reading taken during removal. After the torque reading is correct, using a drift stake the pinion nut.
    • After the torque reading is correct, using a round tip centerpunch, stake the pinion nut.
  19. Position the differential case in the rear axle housing.
    • Install a shim on the left side as shown in the illustration.
    Fig 19: Identifying Shim On Left Side
    G07478459Courtesy of FORD MOTOR CO.
    20. NOTE: The bearing caps must be installed in their original locations and positions.
    NOTE: Apply pressure toward the left side to make sure the left bearing is seated.
    Fig 20: Locating Bearing Cap Bolts
    G07967723Courtesy of FORD MOTOR CO.
  20. Install the left bearing cap and loosely install the 2 bearing cap bolts.
  21. Install progressively larger shims on the right side until the largest shim selected can be assembled by hand.
    Fig 21: Locating Shims On Right Side
    G07478463Courtesy of FORD MOTOR CO.
  22. Install the right side bearing cap with 2 bolts and tighten the 4 bolts.
    • Tighten to 118 Nm (87 lb-ft).
    Fig 22: Locating Differential Bearing Cap Bolts
    G07478446Courtesy of FORD MOTOR CO.
  23. Rotate the differential case to make sure it rotates freely.
    Fig 23: Rotating Differential Case
    G07478444Courtesy of FORD MOTOR CO.
  24. Using the Dial Indicator Gauge with Holding Fixture and Clutch Housing Gauge, measure ring gear backlash.
    • If the backlash is within specification, go to Step  30.
    • If a zero backlash condition occurs, go to Step 25.
    • If the backlash is not within specification, go to Step  26.
    Fig 24: Measuring Ring Gear Backlash Using Special Tools
    G06777044Courtesy of FORD MOTOR CO.
  25. If a zero backlash condition occurs, add a 0.50 mm (0.020 in) shim to the RH side and subtract 0.50 mm (0.020 in) from the LH side to allow backlash indication. Repeat Step  24.
    26. NOTE: If backlash is not within specification, correct by increasing the thickness of one differential bearing shim and decreasing the thickness on the other differential bearing shim by the same amount.
    Fig 25: Locating Bearing Caps And Bolts
    G07967730Courtesy of FORD MOTOR CO.
  26. To increase or decrease backlash, remove the 4 bearing cap bolts, the 2 bearing caps and install a thicker shim and a thinner shim as shown in illustration.
    Backlash Change Required Thickness Change Required
    mm Inch mm Inch
    0.025 0.001 0.050 0.002
    0.050 0.002 0.050 0.002
    0.076 0.003 0.101 0.004
    0.101 0.004 0.152 0.006
    0.127 0.005 0.152 0.006
    0.152 0.006 0.203 0.008
    0.177 0.007 0.254 0.010
    0.203 0.008 0.254 0.010
    0.228 0.009 0.304 0.012
    0.254 0.010 0.355 0.014
    0.279 0.011 0.355 0.014
    0.304 0.012 0.406 0.016
    0.330 0.013 0.457 0.018
    0.335 0.014 0.457 0.018
    0.381 0.015 0.508 0.020
    • If backlash is not within specification, correct by increasing the thickness of one differential bearing shim and decreasing the thickness on the other differential bearing shim by the same amount.
  27. Install the 2 bearing caps and 4 bearing cap bolts.
    • Tighten to 118 Nm (87 lb-ft).
    Fig 26: Locating Differential Bearing Cap Bolts
    G07478446Courtesy of FORD MOTOR CO.
  28. Rotate the differential several times to make sure the differential bearings are correctly seated.
    Fig 27: Rotating Differential Case
    G07478444Courtesy of FORD MOTOR CO.
  29. Using the Dial Indicator Gauge with Holding Fixture and Clutch Housing Gauge, recheck the backlash.
    Fig 28: Measuring Ring Gear Backlash Using Special Tools
    G06777044Courtesy of FORD MOTOR CO.
  30. Remove the 2 bearing caps and 4 bolts.
    • To establish differential bearing preload, increase both left and right shim sizes by the specification shown in the illustration.
    • Using the Differential Shim Installer, make sure the differential bearing shims are fully seated and the assembly turns freely.
    Fig 29: Tapping Differential Bearing Shims
    G07478471Courtesy of FORD MOTOR CO.
  31. Install the 2 bearing caps and 4 bearing cap bolts.
    • Tighten to 118 Nm (87 lb-ft).
    Fig 30: Locating Differential Bearing Cap Bolts
    G07478446Courtesy of FORD MOTOR CO.
  32. Using the Dial Indicator Gauge with Holding Fixture and Clutch Housing Gauge, verify the backlash.
    Fig 31: Measuring Ring Gear Backlash Using Special Tools
    G06777044Courtesy of FORD MOTOR CO.
  33. Apply marking compound and rotate the differential assembly 5 complete revolutions.
  34. Verify an acceptable pattern check. For additional information, refer to DRIVELINE SYSTEM - GENERAL INFORMATION .
  35. Install the axle shafts. For additional information, refer to WHEEL HUBS AND BEARINGS - FULL FLOATING AXLE - FORD .
    36. NOTE: Make sure the machined surfaces on both the rear axle housing and the differential housing are clean and free of oil before applying the new silicone. The inside of the rear axle must be covered when cleaning the machined surface to prevent contamination.
  36. Clean the gasket mating surface of the rear axle and the differential housing cover.
  37. Apply a new, continuous bead of silicone to the differential housing cover as shown in illustration.
    Fig 32: Identifying Sealant Applying Area To Differential Housing Cover
    G06125170Courtesy of FORD MOTOR CO.
    38. NOTE: The differential housing cover must be installed within 15 minutes of application of the silicone, or new sealant must be applied. If possible, allow one hour before filling with lubricant to make sure the silicone has correctly cured.
    Fig 33: Locating Differential Housing Cover Bolts
    G06166968Courtesy of FORD MOTOR CO.
  38. Install the differential housing cover and the 12 differential housing cover bolts.
    • For a stamped steel cover, tighten alternately and evenly to 45 Nm (33 lb-ft).
    • For a cast aluminum cover, tighten alternately and evenly to 32 Nm (24 lb-ft).
    39. NOTE: Service refill capacities are determined by filling the axle with the specified lubricant to the specified level below the bottom of the filler hole.
    Fig 34: Identifying Axle Lubricant Fill Level
    G06777049Courtesy of FORD MOTOR CO.
  39. Remove the filler plug, fill the axle to the level shown in illustration with axle lubricant and install the filler plug.
    • Tighten to 30 Nm (22 lb-ft).
  40. Position the driveshaft and align the index mark on the pinion flange.
    Fig 35: Locating Index Mark On Pinion Flange
    G06166963Courtesy of FORD MOTOR CO.
    41. NOTE: The driveshaft centering socket yoke fits tightly on the pinion flange pilot. To make sure that the driveshaft centering socket yoke seats squarely on the pinion flange, tighten the driveshaft flange bolts evenly in a cross pattern.
  41. Install the 4 new driveshaft flange bolts.
    • Tighten to 103 Nm (76 lb-ft).
Fig 36: Locating Driveshaft Flange Bolt
G06166964Courtesy of FORD MOTOR CO.
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