Product Code:SAE J2469 Title:Clutch Application Powertrain Startability Rating Requirements for Truck and Bus Applications Issuing Committee:T And B Clutch, Transmission And Power Take-Off Committee Scope:Although not limited to, these installations are normally used on trucks considered as Medium Duty (Class 6 and 7), as well as Heavy Duty (Class 8).This SAE Recommended Practice defines powertrain application startability rating requirements for pull type single and twin plate truck clutches.