Your ignorance must be bliss. Automatic transmissions are vastly more complicated these days than the most convoluted HVAC system your ever had your hands in. You either completely missed the part where I said I choose to let automatic transmissions be someone else's area of expertise so that I can focus on other areas I'm vastly more experienced in, and quite frankly that I prefer. I can build an automatic just as well as 90% of the transmission shops in this country, most certainly a stock or moderately upgraded unit with more than an adequate knowledge of them to have long term success from the build, I choose not to because my time is worth too much to discount it enough to be competitive to even the 91st through the 100th percentile of transmission builders. If you'd like a manual transmission done, converted to racing gear and synchro sets, built to some other specification than stock, I've done a couple hundred of them in the past 25+ years I've been doing this.
When you're finally stranded on the road with your 5th wheel in tow and your transmission tells you you've ignored it a couple feet too far, when you have to make the call for the tow that's going to cost you hundreds of dollars, to a shop that's going to see dollar signs in their eyes and won't care one bit about your problems in that moment or after they have bent you over and had their way with you and your wallet, then you'll realize that rather than being an arrogant *** and not actually taking advice, ignoring problems all that time, you could have avoided it all by simply being a little proactive.
This forum is rather slow these days, not a lot of traffic from people with good advice to offer. If you're willing to take advice on a forum, you should be fine with prices to fix you truck sight unseen. It's not like anyone on a forum can give you a psychic connection you your truck and tell you what is wrong. No codes, fine. You need to check line pressure ad monitor live data from the PCM. Have you done either? Have you had someone hook up diagnostics to monitor individual sensor signals, transmission function, torque converter lockup, or any other singular diagnostic? No. All you've done is go to a few places that see you for the sucker you seem to be and get on forums where you are getting answers you don't like, so you ***** about it all. I have ZERO sympathy for someone who can't be compelled to be proactive, to actually go address the issue.
You're asking for advice, here's some additional, in depth advice: Buy a repair manual for your truck. Not a cheesy one book covers all general repairs manual at a parts store, an actual Ford Service Manual on DVD (the dealer doesn't like to sell them, check eBay.) You'll need an array of tools to diagnose the issues, a copy of Auto Enginuity is the best you'll do for engine and transmission data stream based diagnostics without buying a Snap-On device that will cost more than the transmission shops are quoting you for a finished repair. You'll need a DVOM minimum, a DVOM with oscilloscope functions would be better, you'll need it to watch sensor signals. You'll need a good quality set of pressure and temperature gauges to hook up to the transmission and monitor the actual transmission pressures and temperatures. If you're keeping count, you're pushing well past $1000 in diagnostic manuals and tools, if you don't have them already. You may want to consider schmoozing a shop with a good reputation in your area to reduce those costs to a couple hours of shop rate for diagnostic purposes. A good shop will not blindly shoot you a price, you obviously have not found a good shop yet.
And with that, I wish you luck, because you need that more than my advice right now.
Sent by my right thumb!
The Current Truck (Oct-2013 to Present):
1999 (Early) F-350 Lariat, CCLB, SRW, Black/Tan
7.3L Powerstroke, 4R100, 4x4, 3.73, 37x13.50-18s, '05 Axle Swap, 6" Fabtech lift, GTP38 "D66" turbo upgrade, SCT 4-position chip with custom tuning by me, Straight Piped 4" down pipe through 5" dual stacks, N-Fab full length triple steps, Pro-Tech cab guard and tool box, louvered 5th wheel gate, Hella 500 Fog and Driving lamps, much more to come...
The one I'll miss, (Mar-2009 to Jan-2014):
2000 Excursion XLT 4x4
6.8L V-10, 4R100, 4.30, 285/75-18, 271whp / 388wtq
The one I won't, (Jul-2005 to Sep-2012):
2005 F-350 XLT, CCLB, SRW, 4x4 FX4
6.0L PSD, ZF-6S650, 3.73, 35x12.5-18, 4.5" Lift