Heat from welding can cause the bearing riding surface to distort. To assure flatness of the bearing riding surface, perform a 2.705" dia. clean-up cut on the mating surface after welding impeller hub into place. Surface finish must be a 63Ra or better.
Sonnax impeller hub ZF-90-1G replaces worn or damaged impeller hubs when rebuilding ZF4HP16 (245mm) torque converters and is forged from 1045 steel for added strength and durability.