Sonnax offers front cover pilot GM-PI-10 for 1.703" dia. pilots found in GM 298mm LU (TH250C, TH350C, 200-4R, 4L60 & E) units. GM-PI-10 is designed to expand to the correct size when pressed onto the reworked pilot. Only simple machining is required.
For converters with 1.703" pilot dia.