Pinion Depth Measurement

Fig 1: Pinion Gear Depth Gauge Tools

Courtesy of CHRYSLER GROUP, LLC

Ring and pinion gears are supplied as matched sets. Compensation for pinion depth variance is achieved with a select shim located between the rear pinion bearing and pinion gear head.

Measurements are taken with pinion bearing cups and pinion bearings installed in the housing. Take measurements with Pinion Gauge Set and Dial Indicator (special tool #C-3339A, Set, Dial Indicator) (1).

1. Assemble Pinion Height Block (special tool #6739, Block, Height) (3), Pinion Block (special tool #8897, Gauge, Pinion Height) (6) and rear pinion bearing onto Screw (special tool #6741, Screw) (5).
   Fig 2: Identifying Pinion Block, Height Block, Rear Bearing, Front Pinion Bearing And Cone-Nut

   Courtesy of CHRYSLER GROUP, LLC
   NOTE:

   Image depicts the components assembled outside of the housing for clarity.

2. Insert assembled pinion block (1), pinion height block (2), rear bearing (5) and screw into the housing through pinion bearing cups.
3. Install front pinion (4) bearing and Cone-nut (special tool #6740, Cone) (3) onto the screw. Tighten cone-nut until Torque To Rotate the screw is 1.7-2.26 N.m (15-20 in. lbs.).
   Fig 3: Gauge Tools In Housing

   Courtesy of CHRYSLER GROUP, LLC
4. Place Arbor Discs (special tool #8289, Set, Arbor Disc) (1) on Arbor (special tool #D-115-3, Arbor) (3) in position in the housing side bearing cradles.
5. Install differential bearing caps on arbor discs and snug the bearing cap bolts. Then cross tighten cap bolts to 281 N.m (207 ft. lbs.).
   NOTE:

   Arbor should rotate freely in the arbor discs.

   Fig 4: Pinion Gear Depth Measurement

   Courtesy of CHRYSLER GROUP, LLC
6. Assemble Dial Indicator (special tool #C-3339A, Set, Dial Indicator) (3) into Scooter Block (special tool #D-115-2A, Block, Scooter) (2) and secure set screw.
7. Position Scooter Block/Dial Indicator flush on the pinion height block. Hold scooter block and zero the dial indicator.
8. Slowly slide the scooter block across the pinion height block over to the arbor. Move the scooter block till dial indicator crests the arbor (1), then record the highest reading.
9. Select a shim equal to the dial indicator reading.
   Fig 5: Measuring Pinion Rotating Torque

   Courtesy of CHRYSLER GROUP, LLC
10. Install select shim between rear pinion bearing and the pinion gear head.
11. Install pinion gear and establish Pinion Torque To Rotate (PTTR) with an inch pound torque wrench (2).