Photos kinda show wear on the teeth at the ring gear and shaft. Check the ring gear snap ring groove area. Crud likes to build up there.
Ignore the rough aluminum drum. Most of them look like that.
I suggest a kit to over size the AFL valve assembly in the valve body. Its always worn in a high mileage 4L60E and can cause main line pressure problems. It requires a reamer tool to fit the brand of kit you buy. Sonnax has an AFL 4L60E kit, TransGO also has a kit. TransGO kit is much easier to use and install. I used hundreds of them over the years. Lube the snot on the reamer tool if you do that. Usualy you can use a pick tool and check the AFL valve wear as it is still in the valve body. They wear a lot since that valve is always moving a bit. For those reading and wondering about this: the 4L80E suffers with AFL wear too..
TransGo AFL kit comes with or without the reamer tool. You need the reamer. Both kits are a bit pricey. Sonnax is more $$ than the TransGO kit.
If a corvette servo is installed and a concern on ruff shifts? Do not enlarge the shift feed holes in the separator plate. If you replace the OEM boost valve , stay with the same diameter size of boost valve. Boost valves wear out in high mileage too. You can have the advantage of larger servo surface apply with corvette type servo , not the harsh shift.
A wide band for 2-4 gears must have a flat drum surface as mentioned. Always check the drum for level surface with a straight edge. Check a new too. If you reuse the drum , scuff the surface with 320 grit wet... NOT cross wise, scuff in the direction the band rides. Dull surface is good, not ruff surface
If you tow stuff, I suggest the Sonnax billet over drive servo. I have used them for over 200k miles on my own vehicles