it there is a shiftkit in the trans the bumped linepressure could mess upp the pressure reading for the ecu .there is a mod to put a resistor in the wiringharness fooling the ecu to think there is oem pressure
there is a simple box for the dieseltrucks that could be used (it have a adjustible resistor) but i dont remebere the brand right now.
the shift kits for the 46re will typically come with this resistor, I'm conservitive on the line pressure with them if they don't have the extra upgrades needed like borg warner governor solenoid, teflon seal rings and the extra springs in the front clutch. The stock solenoid can't handle the etra line pressure and will eventualy start stick and causing 1-2 shift issues and the 2-3 shift will typically flare without the added clutch retainer springs.
