- 1). Wipe any grease and other debris off the gear casing with a rag to ensure you can see all of its features clearly.
- 2). Count to make sure there are 10 bolts arranged equally around the outer perimeter of the gear casing, similar to the numbers on a clock.
- 3). Locate two lugs, or ears, extending out from the bottom of the gear casing approximately in the 4 o'clock and 8 o'clock position. This will firmly identify the unit as having come with Positraction from the factory.
- 4). Measure the gear casing horizontally, end to end, across its widest point. The measurement will be either 10 5/8 (10.625) inches or 11 inches, depending on the year it was made.
- 5). Look for a bulge running vertically down the center of the gear casing. Most of the 10-inch units you're looking for will have this.
- 6). Place your 1.25-inch socket over the pinion nut. If it fits, it's the 10-bolt, 8.5-inch unit.
- 7). Inspect the entire gear case and center section thoroughly to make sure there are no cracks or other damage that might compromise the unit's integrity.
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