When I dissected the '95 Riviera trans to harvest the internals, I noted the condition of the bands. This trans had about 90k on it btw. The bands had little to no noticeable wear.
When jrs3800 and myself dissected the '93 SSEi trans to see what havoc was created in that slushbox, we noted the condition of the bands in there too. This trans had 174k on it when it was ripped out of the moorings. Condition of those bands...looked damn near identical to what the 90k unit had.
Like Wren said, the bands really don't need to be touched...this is why alot of 4t-60 kits do not include them in their general overhaul kits. Only time they really need to be changed out is after a catastrophic failure...like when the "coffee can" frags itself.
FWIW, in both transmissions I had apart, the thrust washers (or lack of rather) were the weak links.
Welcome, downwardly mobile yuppies, to the dawn of the Age of Nefarious.
1993 SSEi - FrankenJinx - dead and gone.
1994 SSE (136K strong) - 180* t-stat,HD alternator, most unequipped SSE on the club, XM radio, Kenwood CD/MP3.
2006 Chevy Malibu Maxx LTZ - Custom 2.25" manifold-back exhaust w/FM-80. Probably the only Maxx with this system.