Section 05-02A: Axle, 10.25-Inch Ring Gear | 1996 F-250 Light Duty (Semi-Float), F-250 HD and F-350 (Full-Float) Workshop Manual |
| Description | Tool Number |
|---|---|
| Pinion Depth Gauge Tool Set | T79P-4020-A |
The differential case (4204) and drive pinion should be inspected before they are removed from the carrier casting. These inspections can determine the cause of the concern and the resolution.
Wipe the lubricant from the internal working parts and visually inspect the parts for wear and/or damage.
Rotate the gears to see if there is any roughness which would indicate damaged bearings or gears.
Check the ring gear teeth for signs of scoring, abnormal wear, nicks or chips.
NOTE: There is a space provided between the anti-lock speed sensor ring and the ring gear for measuring ring gear backface runout.
To check ring gear backface runout, mount Dial Indicator with Bracketry TOOL-4201-C or equivalent on the carrier so the tip of the dial indicator contacts the backface of the ring gear. Backface runout should be no more than 0.101mm (0.004 inch).
Set up a dial indicator and check ring gear backlash. Backlash should be 0.20-0.38mm (0.008-0.015 inch), with 0.30-0.38mm (0.012-0.015 inch) preferred.
A contact pattern is not an acceptable guide to check for noise. Ring gear and pinion must be checked using the Pinion Depth Gauge Tool Set T79P-4020-A that shows the correct pinion shim required to assure acceptable running condition. Refer to Drive Pinion Shim Selection in the Removal and Installation portion of this section.