Call CRT and get a Billet Steel drum. We had an Aluminum drum but got tired of the fluid changes every 25 passes. Switched to a steel drum and saw no decrease in performance. Was able to go back to a once per season filter and fluid change. I think CRT sells the drum fully loaded with clutches and steels also.
CRT, A&A, Mancini, TCS etc..... They all sell them. I like dealing with John Cope at CRT.