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As mentioned above, you can change the TV pressure values for shift transitions, and that will help dial it in nicely.
I lowered the values under normal driving conditions, so the shift transitions or nice and easy. For heavy throttle conditions, I raised those values so it yields a nice snap for each shift.
I've been running/abusing a Circle D converter for years now and no problems to speak of. It's a multi-disk lockup that is much stronger than stock with a 3000 stall speed (you can get them with a lower stall speed too). Their website doesn't have info for E4OD applications so it'd be best to call them.
Intercooled Vortech, Victor Jr. heads, roller cam, 62lb injectors, 2800 stall converter, Eaton Locker, Pickrel Headers and Exhaust, FMS Mass Air using SCT tuning software. Road trip and dragstrip ready!
Definitely run the valvebody first. Mechanical is always better than a computer for Tranny upgrades. Also a firmer shift is actually better for the longevity of the transmission. Smooth shifts require a longer transition= heat =Bad for tranny. Jus sayin
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