Another cool 42RLE fact, is that it is a dodge caravan transmission turned longitudinally in our TJ's. That's why it's so heavy Duty, cause the Caravan is a beast. It's also the same as so many other cool Chrysler rigs. The Nitro, intrepid, JK, and more! Chrysler loved their design and just turned it all kinds of directions, this way and that. But internally, it's the same.
It's not a horrible idea on paper. No sprags, no bands, and minimal valves. But that shuttle valve gets pounded each time it shifts. And it times shifts and pressure off CVI's, clutch volume indexes. This is why when you rebuild one, you cannot "tighten" clearances. Ands I will follow the Shift kit instructions on point. Because you cannot reinvent the wheel with this one boys. You only get so much. Do I "need" these parts. Nope it shifts fine.
I am replacing the solenoid block and PRNDL switch with Mopar units while in here.