how much torque reduction can stock 4r75w handle?

blownstang4.6

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Trying to dial in the trans in the tune. Torque management is pulling a lot of timing before shifts. Car is an 04 Mach 1 with an intercooled Vortech S trim, BCA modified valve body, Circle D 4c converter, TruCool 40,000gvw cooler, and VRS o/r x pipe. It made 425/387 through an unclocked converter with 11psi and 11.5 degrees of timing at 6100rpm.

At my power level and the stock trans how much torque management can be pulled out? I'd like the trans to last as I know a stock 4r75w can hold up behind 500rwhp if setup properly. Right now it is shifting around 5500rpm, but working on getting the shifts up to 6,000rpm.
 

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