Adjustment Specifications

1967 Ford Fairlane Base, 6.4L Eng VIN Z, Not Available TransSECTION Adjustment Specifications
Ring Gear Backface Runout .003"
Side Gear Thrust Washer Thickness .030"-.032"
Pinion Gear Thrust Washer Thickness .030"-.032"
Differential Bearing Preload (New) .008-.012"
  (Used 1964-69) .003-.005"
  (Used 1970-72) .005-008"
Nominal Pinion Shim Thickness
  8-3/4", 9", 9-3/8" Ring Gear .015"
  8-1/2" Ring Gear .030"
  8" Ring Gear .022"
  7-1/4" Ring Gear .017"
Ring Gear to Pinion Backlash .008"-.012"
Maximum Backlash Variation Between Teeth .003"
Tightening Specifications

Application Ft. Lbs:
Bearing Cap Bolt
  7-1/4" Ring Gear 40-55
  8" Ring Gear 55-70
  All Others 70-85
Bearing Adjusting Nut Lock Bolt 12-25
Carrier to Housing Stud Nuts
  8", 8-3/4", 9", 9-3/8" Ring Gears 25-40
Pinion Retainer to Carrier Bolts
  8", 8-3/4", 9", 9-3/8" Ring Gears 30-45
Ring Gear Attaching Bolts
  7 1/4" Ring Gear 40-55
  All Others (1964-71) 65-80
    (1972) 70-85
Pinion Shaft Lock Pin
  8-1/2" Ring Gear Only 15-22
Rear Cover Screw & Washer Assemblies
  8-1/4" & 8-1/2" Ring Gears Only 25-35
Minimum Torque to Tighten Pinion Nut For Pinion Bearing Preload
  7 1/4" & 8 1/4" Ring Gears (1) 140
  8", 8 3/4" & 9" Ring Gears (1) 175
  9" & 9 3/8" W/Collapsible Spacer 180-220
Pinion Bearing Preload (Collapsible Spacer) (2)
  Original Bearings 7-1/4" Ring Gear 6-12 INCH lbs.
  8", 8-1/2", 8-3/4" & 9" Ring Gears 8-14 INCH lbs.
  New Bearings 7-1/4" Ring Gear 17-32 INCH lbs.
  8", 8-1/2", 8-3/4" & 9" Ring Gears 22-32 INCH lbs.
Pinion Bearing Preload (Solid Spacer)
  9-3/8" Ring Gear 15-35 INCH lbs.
(1) If preload exceeds specification before this torque is obtained, install a new spacer.
(2) With oil seal.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.