Important! The gearbox code must be determined prior to ordering. The gearbox code is engraved on the underside of the gearbox bell housing. Only applies to gearbox code HPC / THPC / THPE,Important! The gearbox code must be determined prior to ordering. The gearbox code is engraved on the underside of the gearbox bell housing. Only applies to gearbox code HPA / THPA