The tail shaft housings that NetGain Motors, Inc. utilizes have been designed by us and cast to better than the original quality. We have added struts for additional strength, and fittings for grease. These tail shaft housings have been designed to fit the TransWarP ™ Motors they are designed to match. TransWarP ™ Motors must utilize a tail shaft housing, and we do not guarentee the use of any tail shaft housings other than the ones we sell. The bolt pattern, length and other dimensions match the Turbo 400 "shorty" tailshaft housing parameters.