The 3.90's really woke this thing up, especially with the loose 3200 stall converter I put in.
With the overdrive and lockup the cruise is still great. I want to say i saw it was still just under 2500 rpm at 85mph. It has a pretty large tire though. The 275/50/20 is like 30.5" tall.
It pulls so much harder now it's really a different truck and matting the throttle at anytime instantly brings the rpm up over 3000 rpm where the cam is happy and it's making boost.
The only complaint currently is that I have to extend the blow off valve discharge out front or underneath somewhere, when on the freeway at light throttle a ton of air is bypassing as the charger is spinning fast enough to make boost but with the throttle not open it all gets bypassed and it's pretty damn loud in the cab.
I didnt even have to try and power brake it to get them spinning. I just stopped, let off the brakes, and floored it.. I'm guessing if I power braked it I could leave an expensive but endless pair of stripes.
Glad to hear those are working out well JJ.