Doc is just bein' thrifty There are no drawbacks for an aftermarket sprag.My builder also installs "set screws" for the stock sprag unless it's been spun.I bought the billit steel drom from http://www.tcsproducts.com/products/subcategory/14/ As previously stated,the billit steel or even the steel lined aluminum drum is a very logical up grade.I dropped my trans off to Tom yesterday,he wants to use a babbit bearing for the new converter and trim off what has to go in order to use the new CSR sheild.Insurance for the new HP levels I will be playin' with