Re: 4.0 to 4.6 Stroker Engine
You can get almost this amount of power for a lot less and will be more durable. Durable as in the engine, transmission, and the other parts of the drive train.
LSx/4L60, expensive purchase, expensive and or time consuming install (electronics), expensive to repair.
Consider rebuilding or a rebuilt older 350 with a stock or mild cam with a carb for now then go for fuel injection or propane later.
Depending on what tires and gears and transfer you run you don't need an overdrive to get good or great gas mileage.
.........From the Novack site: many Cherokees with larger tire sizes and proper axle ratios will still allow for a respectable freeway cruising RPM. An individual is best to perform some gearing calculations as part of this stage of the planning.
this is one I like because it is easy to compare two set ups at a time. http://www.grimmjeeper.com/gears.html
If I remember right you want crusing speed to be at peak torque of your engine. So that RPM is higher for 6's than 8's. I think around 2100 for 8's but that is from memory and it still depends on how you build it.
I spoke with Todd at Desert Fab before I did or had done much of the conversion work on my Willys Pickup. I had all these ideas of overdrives and other stuff. My discussion with him saved me a lot of time and money.
In the end I have a early 70's 350, circle track 2 barrel carb from a NOVA, built TH350 transmission, Dana 300 transfer.
Went with the Dana 300 not only for the durability and gearing but because the TH350 AA adaptor to the 300 is the same as for my one day dream of an Atlas.
My opinion, is just that an opinion.
DISCLAIMER: Check with your emmissions laws. I am not sure that if you have to pass emissions you can do it with an engine older that your vehicle.
Tom Roberts, Certified Hyperbaric Registered Nurse and Jeep Nut
53 Willys Pickup, 59 Willys Wagon, 76 CJ-5, 83 Diesel Suburban, 496 Big Block Silverado
I may not agree with what you say, but I will defend to the death your right to say it.