F 250 4WD Super Duty V10-6.8L VIN S (2001)
3. Remove the differential housing cover and drain the lubricant.
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Position the differential housing to allow the lubricant to drain completely.
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Clean the gasket material from the differential housing and the differential housing cover.
4. NOTE: An inspection can find the cause of the concern and determine the resolution.
Carry out the following inspection.
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Remove all the lubricant from the internal parts and visually inspect the parts for wear and damage.
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Rotate the gears to check for roughness, indicating damage to the bearings/gears.
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Check the teeth of the ring gear and pinion for signs of scoring, wear, nicks and chips.
5. CAUTION: The differential ring gear and pinion must be clean and dry to obtain an accurate reading.
Using the special tools, measure the ring gear and pinion backlash at three equally spaced points. Record the reading.
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The backlash tolerance must be within the specification and cannot very more than 0.05 mm (0.002 inch) between points checked. A backlash
variation or more than 0.05 mm (0.002 inch) indicates gear/case runout.
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Make corrections for high or low backlash during assembly by changing the differential bearing selective shim thickness.
