Adjusting Clutch Pack Clearance
- Disassemble clutch packs, noting order of disassembly for reassembly reference. DO NOT clean clutch plate friction surfaces with solvent. Wipe with clean shop towel only. Inspect clutch plates. Replace plates if they are uneven or extremely worn.
- Install Differential Clutch Gauge Base (T84P-4946-A for 7.5" ring gear; T97P-4946-A for 8.8" and 9.75" ring gears) in vise. With side gear facing down, slide assembly onto base without shim. Install Differential Clutch Gauge Disc (part of T84P-4946-A for 7.5" ring gear; T80P-4946-A for 8.8", 9.75" and 10.25" ring gears) on top of assembly without shim. See Fig 2 .
- Install nut on threaded end of gauge base. Tighten nut to 60 INCH lbs. (6.7 N.m). Using feeler gauge, select thickest blade that will enter between clutch gauge and clutch pack. This reading will be thickness of new shim for that clutch pack. Shims are available in .005" (.13 mm) increments. See CLUTCH PACK SHIM SIZES table. Repeat procedure for opposite clutch pack.
- Disassemble gauge and clutch packs. Lubricate clutch pack friction plates with Friction Modifier (C8AZ-19B546-A or EST-M2C118-A). Reassemble side gear and clutch pack with appropriate size shim. DO NOT mix plates from side to side.
NOTE:
A Differential Clutch Pack Rebuild Kit (F5ZZ4947-B) is available for the 7.5" differential.
CLUTCH PACK SHIM SIZES
| Part Number | Shim Thickness - In. (mm) | |
|---|---|---|
| 10.25" Diameter Ring Gear | ||
| F7TW-4A324-CA | .025 (.64) | |
| F7TW-4A324-DA | .030 (.76) | |
| F7TW-4A324-EA | .035 (.89) | |
| F7TW-4A324-FA | .040 (1.02) | |
| F7TW-4A324-GA | .045 (1.14) | |
| F7TW-4A324-HA | .050 (1.27) | |
| F7TW-4A324-JA | .055 (1.39) | |
| F7TW-4A324-KA | .060 (1.52) | |
| 9.75" Diameter Ring Gear | ||
| F7TW-4A324-AA | .015 (.38) | |
| F7TW-4A324-BA | .020 (.51) | |
| F7TW-4A324-CA | .025 (.64) | |
| F75Z-4A324-DA | .030 (.76) | |
| F75Z-4A324-EA | .035 (.89) | |
| F75Z-4A324-FA | .040 (1.02) | |
| F75Z-4A324-GA | .045 (1.14) | |
| F75Z-4A324-HA | .050 (1.27) | |
| F75Z-4A324-JA | .055 (1.40) | |
| F75Z-4A324-KA | .060 (1.52) | |
| 8.8" Diameter Ring Gear | ||
| EOAZ-4A324-G | .025 (.64) | |
| EOAZ-4A324-H | .030 (.76) | |
| EOAZ-4A324-C | .035 (.89) | |
| EOAZ-4A324-D | .040 (1.02) | |
| EOAZ-4A324-F | .045 (1.14) | |
| 7.5" Diameter Ring Gear | ||
| E4DZ-4A324-G | .025 (.64) | |
| E4DZ-4A324-H | .030 (.76) | |
| E4DZ-4A324-C | .035 (.89) | |
| E4DZ-4A324-D | .040 (1.02) | |
| E4DZ-4A324-F | .045 (1.14) | |