Your knowledge of the spicer auxiliary tranny's is above mine. I've not installed mine, and don't know if I can do it.
The 7041 is a beast. It's too big for my application. My wheel base is fairly long and I could run a normal drive shaft from the aux to the axle.
With 7.06 first, 2.31 aux (not the 2.37 I said above), and 5.14 in the axle... I'd have an 84:1 reduction. That's a lot of gear down!
My vent is the same as yours, and your elbow should work great. Yes the front mount will be easy due to the rotation of the mount (forgot about that). My shift linkage is on the passenger side, not the top as yours is, so clocking would make it difficult. I have the shifter that came with the aux, so I know mine will work.
I don't know how much of a concern the lube would be. Your certainly aware of the situation and what will happen. Sorry I don't have advice.
If I install mine, I'll likely just live with it hanging down low. I've got 19.5 tires and that helps a little. I could always put an inch or two lift to gain back what I lose.
Keep us informed.
