Pinion Depth
- Assemble Pinion Depth Gauge (T79P-4020-A). Install aligning adapter, gauge disc, .89" (23 mm) for 7 1/2" ring gear and 1.19" (30 mm) for 8 3/4" ring gear, and screw. See Fig 1
. Place rear pinion bearing over aligning disc and into bearing cup of carrier housing.
Courtesy of FORD MOTOR CO.
- Install front pinion bearing into front bearing cup. Place handle onto screw and tighten to 20 INCH lbs. (2.25 N.m). See Fig 2
. Ensure pinion depth gauge is properly installed and tightened.
Courtesy of FORD MOTOR CO.
- Apply a light film of oil to pinion bearings. Rotate gauge block several times to seat bearings. Rotational torque on gauge block assembly should be 20 INCH lbs. (2.25 N.m) with new bearings. Final position of gauge block should be 45 degrees above axle shaft center line.
- Clean differential bearing bores thoroughly and install gauge tube. Tighten bearing cap bolts to proper specification. See TORQUE SPECIFICATIONS
table. Use flat pinion shims as a gauge for shim selection. Hold gauge block in proper position and measure clearance between gauge block and gauge tube.
- Correct shim selection is accomplished when a slight drag is felt as shim is drawn between gauge block and gauge tube. Shims are available in various thicknesses. Install correct shim on pinion for reassembly. Pinion bearings must be installed in the same location as during pinion depth measurement.