The eight-speed rear wheel drive kit comes in two varieties: PR and PRX.
According to the company, PR kits are designed for the everyday rebuild. They come with a 12 to 18% torque capacity increase. Latch and clutch regulator valves trigger more quickly, shortening shifts.
PRX kits are designed for the heavy duty applications that have boosted turbos and power adders with 28 to 38% torque capacity increases. Latch and clutch regulator valves trigger more quickly to the higher pressure levels shortening shifts.