Dang, if you are getting 5.9 to 60 just flat footing it, that is one helluva tune you got there! At 6,300 lbs that would be pushing nearly 500hp at the crank according to drag math. Nice!I still get slower 0-60 doing 4h into 2wd.
4Auto gives me my best 0-60s and I tried several times with your method of changing into 2wd after hitting second gear.
When you mean brake stalking to 1500, you mean revving it in drive with your brake on then letting it? I didn't do that, I guess that would squeeze a bit out as mine was idle at a stoplight. Light turns green brake goes off and same foot goes on the gas in 4auto.
I don't see any Ram 1500s doing a 7.6 sec 0-60. That's really slow. Even the current Pentastar v6 can do that in an Ram... Until it comes out in a Ram all these numbers are crap, and calling it "way faster" is nonsense. The HO will be faster, but the SO doesn't look like it, which is fine because it's not designed to be that way, putting a turbo on the 5.7 would make it faster, not putting in an tiny engine and slapping a turbo on it, that's meant to cover the gap for the huge decrease in power
I'd have to agree about 4H though. After a prior comment from HSKR, I did compare 4A to 4H at a test & tune at the strip (different vehicle but same transfer case). As in your case, 4A consistently gave me better times. I'd lose typically around 0.2-0.3 seconds and 3-4 mph less trap.
I had previously assumed 4H and 4A would deliver identically, because I figured they'd be behaving identically during WOT in a straight line. And from HSKR's experience thought maybe 4H would even be faster.
Not sure what's happening mechanically to explain the difference, but it was very repeatable. Maybe 4A reduces clutch engagement (friction) at higher speeds/big end of the track? 60 ft and 330 ft times were somewhat close. I alternated back and forth for 5 runs in a single evening.