F 550 4WD Super Duty V8-7.3L DSL Turbo VIN F (2001)
Special Tool(s)
Removal
1. Raise the vehicle on it hoist or raise the rear end of the vehicle with a jack. Install safety stands under the frame rails and lower the Jack or hoist
enough to allow the rear axle to drop into the rebound position for working clearance.
2. Remove the differential housing cover and drain the lubricant from the rear axle.
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Clean the gasket material from the differential housing cover and the differential housing.
3. NOTE: An inspection can find the cause of the concern and determine the resolution.
Carry out the following before disassembly.
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Remove all the lubricant from the internal parts of the conventional differential assembly or Trac-Lok differential assembly. Visually inspect
the parts for wear and damage.
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Rotate the differential assembly to check for any roughness, indicating damaged bearings or gears.
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Remove all the lubricant and check the differential ring gear and pinion teeth for signs of scoring, abnormal wear, nicks and chips.
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Use a magnet to search for heavy metal particles indicating component damage.
4. CAUTION: The differential ring gear and pinion must be clean and drive to obtain an accurate reading.
NOTE: Measure the differential ring gear and pinion backlash at three equally spaced points.
Using the special tools, measure the differential ring gear and pinion backlash.
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The backlash tolerance is 0.13 - 0.120 mm (0.005 - 0.008 inch) and cannot vary more than 0.05 mm (0.002 inch) between points checked. A
backlash variation of more than 0.05 mm (0.002 inch) indicates gear/case runout.
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Move the differential ring gear toward the pinion to correct high backlash.
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Move the differential ring gear away from the pinion to correct low backlash.
5. Remove the axle shafts.
