Message BJsOffroad on their website.
With your inquiries. They will have nearly everything you need.
I am new to the wide track game but my Cherokee is sitting on 32.8" tires and it hasn't rubbed yet on stock springs.
Rusty's makes an all spring 4" lift kit that is relatively cheaper than everyone else's except for rough country. And from what I understand the Rusty's kit's ride is way more forgiving.
If you'll be wheeling you might want a bigger lift.
A 4" lift should allow for 35" but it might be tight.
Some say the SOA warps your stock springs so you'll need a new set of springs anyways. Also you will need to install a high steer kit in addition to the spring over axle shackle flip. So it will cost over $1,000 to do it right.
The Rusty's kit is only $500-$600 depending where you live.
I have one on my Wagoneer and it was really easy to install. I only needed a hand to bleed the brakes. I'll be purchasing a second one for the Cherokee so it can run 33" and have plenty of room.
This should help with your tranny questions.
Wag Rebuilt 360, 260H, 727, Locked 44, AMC 20, 208, 31" M/T's, 4" Rustys, 2.5" Duals. SOON:SOA SF, 496, T400, Doubler, D60's, 37" M/T's <-TOY
Cherokee Rebuilt 360, 2" Duals, mostly stock. SOON: Hot Street 401, 4'' Rustys, 33" BFG A/T's maybe a T-case to get rid of Q-Track <-TOW RIG