Towing Torque ConverterGM 4L80E, 4L85E,Trans.Stall Range: 1,600-2,200 RPMDia.: 13 in.Spline: 35Bolt Circle: 11.675 in.Crank Pilot: 1.703 in.Lock Up: YesAnti-Ballooning Plates: NoBalanced: Yes JEGS 555-60433 Street Performance Torque Converter Features: Fits GM 4L80E, 4L85E Transmissions 1,600-2,200 RPM Stall Speed Hardened Chrome Moley Impeller Hub Torrington Style Incased Bearings Extreme Temp Heavy Duty O-ring Modified Heavy-Duty Stator Oversized Extreme Duty Single Disk Lock Up NO � Anti-Balloon Plate Four Corner Tac Welded Fins or Furnace-Brazed 3 Welded Nuts with M10-1.5 Threads for Attaching Bolts to Torque Converter Leak & Pressure Tested Digitally BalancedJEGS 555-60433 Street Performance 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 Blue Loctite on Torque Converter Bolts Use Type F transmission Fluid for Best Results Additional Transmission Cooler is Recommendedr