There are tapered bearings and cups on each end of the pinion gear and the differential carrier assembly in the VT40 Transmission. GM-52318 is a unit repair tool set consisting of two precision-ground gauging tools that allow for the selection of the proper bearing cup shims to ensure correct bearing preloads. The spring-loaded gauging tools fit snugly inside the transmission, located between the case and the torque converter housing.
Eight standoff bolts and spacers separate the case and housing, allowing the technician to insert special, extended-length feeler gauges into the gaps and determine which shim thickness to install. The shim gauges, feeler gauges, and hardware are packaged in a durable custom storage case.