Not trying to thread jack, but when you say you can shift it, how does that work since it still has a computer, I'm looking into that hd2 kit for my next mod after I get my gears and rear end swapped
When you manually shift gears in our stock transmission for instance, you're only setting a limit to which gears the computer has access to. For example, when you put the car in 1st and drive off, the computer won't be allowed to shift into 2nd until you move the shifter into 2, and so when you do, 2nd gear becomes available to the computer and it will shift when it's necessary, you aren't commanding the transmission to upshift.
Say you do a WOT pull from 1st, moving the shifter up each time when you reach desired rpms in each gear, putting the shifter in 2 allows the computer to make the upshift, and moving it into drive for 3rd gear gives the transmission access to 3rd and o/d.
With the shift kit, moving the shifter in 1, 2, and drive makes the transmission shift into those gears the instant you do so. Putting in drive gives back the computer control. If you get an aftermarket shifter you can stay in the 3rd without giving control back to the computer. Make sense?