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Old 09-15-2014, 11:48 AM   #1
Mike Pearson
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Default Re: Powerglide factory drum and high RPM

Larry,

I have a cast iron drum in my powerglide. No issues with rpm to 8800. I have also ran a Coan lightened steel drum in place of the aluminum, There was no ET difference between the Coan and the aluminum drums. Not sure on the stock drum
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Old 09-15-2014, 06:06 PM   #2
RICK W
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Default Re: Powerglide factory drum and high RPM

Are you turning down the stock drum, how much?
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Old 09-15-2014, 11:11 PM   #3
Adger Smith
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Default Re: Powerglide factory drum and high RPM

Nit turned down. Milled out in areas the don't do anything good for it.
In short, I delete any metal that is not necessary.
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Old 09-15-2014, 11:18 PM   #4
Tom Goldman
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Default Re: Powerglide factory drum and high RPM

I just freshened up an old Comp Elim trans that I did 20 years ago with a lightened stock drum .
Guy sold it to a bracket racer with a SBC that turns 8800 rpm, this thing has probably well over a thousand runs with no problem.
As Adger said , the lightning is done by plunge milling the front face of the drum. ....I've seen many of them done this way , and never saw a problem with one.
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