Alum vs Steel Drum

[ZenzenRacing]

Need your help! Do you think there is alot of Et or MPH change with a steel or alum drum(5 Clutch pack) in a 2 speed? SS/ 275hp 327chev. We killed a new Ati alum in one pass! Thanks, Ron

[Alan Roehrich]

An aluminum high gear drum makes a measurable difference in a Powerglide, especially in a small block car. If you hurt a new ATI part, call them, they'll make it right if it is their fault.

[ZenzenRacing]

Thanks Alan, I will call them and see what they say. Just haven't had luck with warr parts. It was the new one with the steel insert. May have to put the old Ati back in for the next race.

[Mike Pearson]

I found no difference when I went from the aluminum drum to the steel drum. I used the Coan lightened steel drum in one trans. That worked real good. I have a stock one in the trans I have I the car now. What happened to the drum that just tore up?

[ZenzenRacing]

It was torn up bad, like the band wasn't releasing in high. All we did is replace it with a new band and steel drum and cleaned the trans and it was great. ATI won't call back after a few messages left.

[Alan Roehrich]

What band did you use with the aluminum drum? What was the band adjustment procedure?