Opinions on 4 speed with OD

I run an OD box, might even be aluminum (can’t remember for sure right now). The rpm drop isn’t great but I don’t remember ever saying I can’t stand it. Could be better, but I like my 3.21’s and OD on the highway running 2000 rpm at 65 mph.

Biggest issue I have is the large rpm drop has done a real number on the synchro’s. It’s not undriveable yet, but I have to be pretty gentle on a high rpm shift to avoid grinding gears.

I’m actually planning a 6 speed swap in the next 18 months or so. Who knows if it will happen, but it’s the plan. Unless I buy another 6M Challenger, then who knows.