Oh man my conversion was not on the cheaper side.
You can put a dana 20 or the 4406 F-150 case behind the 4r70w alot easier then getting the AA adapter ($600) and having the trans rebuilt to fit the output shaft ($800)
My radiator was $500, I bought my engine mounts instead of making them, I used the Canton billet oil filter adapter, I had driveshafts made, the big break I got was the free headers. Exhaust was $300+ it all adds up, tune up parts, etc,
I spent about $6500 and did 100% of the work myself (aside from trans and exhaust later)
It adds up so you have to spread it out over time!!
I have seen them done for 1/8 that cost, but then again I have also seen some seriously hack job 5.0L conversions, like with wire nuts on the harness and 100 extra wires still in place, hacked up engine mounts, notched frames, etc you name it its been done, from $500 to $50,000
if I was to do it again I would likely skip the transfer case adapter and build a dana 20 with low range gears, or go straight to the Atlas
The 1354 doubler would be great though now since I have the adapter.
The 4406 t case I put in my 96 is a *****IN case, it has a really low low it feels like and its really solid, but its also HUGE and barely fits inthe 4 door ex, it may not fit so easy in other trucks but its a great case behind the 5.0L explorer drivetrain