chrysler 3 speed manual dodge rv 360 Swap

You don't need aftermarket.
Just watch the FABO ads, Something pops up almost every week.
Sometimes even, a complete take out.
I have bought MINTY Overdrive boxes for $50 at swapmeets. But I don't run those anymore; I busted three of them. Two lost the M/S od gears when I put to much torque into them, and I zinged the front clusterdrive off a third one. So I called up Jamie at Passon Performance, And he found me a minty Commando gearset. Which I have not been able to bust since about 2005.