Gear Vendors are BS. This is from experience and 2-1/2 years of nothing but headaches and doing GVs R&D. My Challenger had one of the first auto-shift sequencer units installed. It's working now, but not as it should. "Gear splitting" LMAO - Gimmick, it's faster using the stock shifter, the GV uses a solenoid and needs time to shift, shift earlier? Yes, but it's still slow and very inconsistent. OD is good, I run 3.91s in the R/T and in OD cruise like 3.05s but it kicks out of OD every now and then but we have this sorted now. 3 modules later, big $$$ spent and time on the phone to Rick (head honcho) got me where I am today.
Kenny Wayne Shepard & Joe Rogan are also having trouble with their units and still have to be addressed. The stock unit (NOT the Auto-shift) are fine but still a load of BS. You have to manually shift in and out of OD which creates a "pause" or delay in shifting, do searches on videos, it's very noticeable in audio and visual form. The auto-shift sequencer module unit was created for this reason, ease and quickness of driving using this unit. Practice does help but even Rick said getting each gear perfect is impossible. If you mess up and shift out at high rpm.......bad news for you and worse for your engine (which is in the rear view by this point). A lot of money for 1 OD gear. I'm not kicking this product in the nuts, if anything, I should be BS and saying it's the best ever as I own one, but I can't, it's easily the worst mod I've ever had in 10 years of driving in my young life and 12 cars, period.
My 0.02c - I don't want anyone going through what I had too. Have a few big threads @ cuda-challenger on it.