I'm in Lynchburg, VA. I doubt there's going to be anybody here. Richmond, Roanoke, and Greensboro NC, are equidistant. The truck has been doing this for awhile. I'd trust it to make an unloaded trip, which is the appeal of getting it done quickly at a builder/installer, perhaps even one that could have a core prepped before I make the drive. That said, I'd rather not drive to Ohio if there's a solid option closer. Maryland is not a bad drive.
Are there bad experiences from ATS? Corners cut?
It does appear a local "diesel performance" shop installs Suncoast and BD units.
The SDP webpage had me sold on their base 550 build until I saw WA. I guess they're still an option but it adds the cost/hassle of separate shipping, core return, and install. Keeping the cost reasonable would be nice but it is what it is. There will always be "next" thing on this truck, but it's rust free and lots of little things have been done. It seems worthy of a solid trans to keep it reliable as a family recreation workhorse.
I assume I'm a pretty basic stock+ build customer? Extra clutches and basic valve body mods, better converter, etc? I don't feel like I need a higher stall converter. Any reason to avoid a Goerend C? I assume opting for the Goerend oiler plate would help C3 have a long, happy life given the brunt of our towing work seeps to be done across 3/4/5? I'd like to do this and the transfer case and never worry about anything behind the flex plate again.
Call Evan at Inglewood Transmission and ask who his dealers/installers are in your area. I know of a few down there, but they are a few hours from you. Best just get the info from the source.