Recognizing a IE7990 Direct drum

[Opie]

Some direct drum pictures.

[Opie]

Pic 1 shows the weight of the piston and drum. IE's direct drum is the lightest billet steel drum available that includes both OEM and aftermarket.

Pic 2 shows the fill holes are round and not biscut cuts. This is more difficult to produce but makes for easier installation and for faster piston apply.

Pic 3 shows the wieght of the drum without the piston.

Pic 4 shows the outer counter bore. Unlike some of the other aftermarket drums this one excepts both styles of factory rear clutch retainers.

The steel used to make the drum is three times harder than other measured aftermarket drums. The outer finish was designed/tested for the optimum kickdown band apply and will withstand the most aggresive of bands. The piston is over 30 percent larger than OEM. It does NOT give a 3rd to 1st drag shift when coming to stop with a 48 RE valvebody.