Towing Torque ConverterGM 4L60E, 4L65E, 4L70E Trans.Stall Range: 200-300 RPM Over StockDia.: 300mmSpline: 30Bolt Circle: 11.063 in.Crank Pilot: 1.703 in.Lock Up: YesAnti-Ballooning Plates: NoBalanced: Yes JEGS 555-60419 Performance Towing Torque Converter Features: Fits GM 4L60E, 4L65E, 4L70E Transmissions 200-300 RPM Over Stock Stall Speed 300mm Diameter for LS Type Engines Designed for the 2 Step 30-Spline Input Shaft Torrington Style Incased Bearings 4 Corner Tac Welded Fins or Furnace Brazed Hardened Chrome Moly 2 in. Impeller Hub Modified Heavy Duty Stator Extreme Duty Lock Up 3 Welded Nuts with M10-1.5 Threads for Attaching Flexplate to Torque Converter Leak & Pressure Tested Digitally BalancedJEGS 555-60419 Performance Towing Torque Converter Notes: All Stall RPMs will vary Depending on Engine Set-Up VS Weight of the Vehicle VS The Gear Ratio and Tire Height Run Out For use with Grade-8 hardware only Use Type F Transmission Fluid For Best Results Use Blue Loctite on Converter Bolts Additional Transmission Cooler is Recommended