“ Eleven Inch Super Street Raptor “Fits 4L60E transmissions, 1998 up LS1 type motors only. This 11 Inchstall converter is balanced, has furnace brazed fins, all bearing construction and a Sonnax carbon fiber clutch. This converter is lighter and has an inch smaller diameter than the stock size. It actually has a full size 12 inch clutch with an 11 inch converter body, notice the 1/2 inch inset on each side.This converter can be ordered with stall speeds of 2600, 2800, 3000 or 3200 RPM. May stall up to 200 RPM higher with enough low end torque. Good up to 550horse power.