The T/C is tighter (I can roll uphill with a loaded trailer.

) Goerend will make the T/C with any stall speed you want. Machine it right in-house.
Has a modded valvebody. Higher line pressure (which helps keep clutch packs from slipping). Shifts firmer than stock, but won't snap your neck. At least the 47RE I have, the PCM "learns" how you drive. Harder you drive, the firmer the shifts. Drive with a ligh foot, and it softens up the shift, same as a stock trans will. Also, if you pull a trailer, it will firm up the shifts as well.
Can tell that it is shifting, unlike a mushy shift in a stock trans. My stocker was so mushy, it almost felt like I had a hydrostatic transmission in the first 3 gears.
Never driven a truck with a 48RE, so I don't know what they shift like stock.
Dave also has laminated flexplates and billet shafts, if needed. I don't have them, though. Just brand new OEM shafts in mine. He WON'T reuse old shafts. New only.