This is a replacement case for the Eaton™ 19670 Posi-Traction. This upgraded case is produced from through-hardened 4140 alloy steel and solves the problem of cracked and failed cases, while increasing gear life. It uses GM 12-Bolt axle side and pinion gears for the 30-spline inner shafts.  Inner parts not included.  Installation - Service instructions can be found on Service Bulletin #0118