Components

Material: Pink non-stick, Standard

Case and Pinion Spline: 489 (10 spline), 489 (29 spline), 741 (10 spline), 741 (29 spline), 742 (10 spline)

Ratio: 3.23, 3.55

Manufacturer: DoctorDiff Gear

Application: For 741 or 489 Case, For 742 Case

Last 3 Digits on Casting: 489 w/Crush Sleeve, 489 w/Solid Pinion Bearing Spacer, 741, 742

Spline: 30 Spline, 35 Spline (requires custom axles)

I am using: Green non-adjustable wheel bearings, OEM adjustable wheel bearings

Casting Number (last 3 digits): 741, 742, 489 w/Crush Sleeve, 489 w/Billet Crush Sleeve Eliminator

Carrier/Suregrip Type: All others (2.0" bearing journal), Clutch suregrip or pre-1969 open differentials (1.8" bearing journal)

Bearing Manufacturer: Koyo USA/Japan, Timken USA

Bearing Inside Diameter: 1.8" (early style), 2.0" (late style)

Pinion Spline: 10 Spline 8 3/4", 29 Spline 8 3/4" and all 9 1/4", 29 Spline Dana 60