I have a BRF gov in my CZF trans and pinned the gov. spring, I didn't drill any holes though as I wanted to get the WOT shifts down bettween 5000-5500, well now it's at 4500-4800. Only vb mods are Superior's line bias spring, tv valve & plunger spring, also stiffer 1-2 & 3-4 accum springs and 6...