A search doesn't turn up much. I did find this though.
Q45tech wrote:The beauty of the whole chemical clean and then flush is the specific detergents [BG Quick Clean for Transmission] gets the valve body and clutches clean of the varnish that the old ATF creates,
New ATF won't attack the varnish, you'll only be exchanging fluids [with pan drop and drain].
I had trouble checking my AT fluid level after pulling/replacing the radiator, starting with locating some level ground to park on close to home. I knew I lost some fluid, and actually had it checked at the dealership, who reported that the level was OK. I hadn't checked it before I pulled the radiator, and still have a new filter and gasket.
A rep at the dealership actually recommended against stirring things up in there by doing another flush now (records indicated that we'd had one done a few years ago), but maybe he's grown tired of seeing old J30s roll in for service and their owners with questions.
A flush, with a coupon, runs about $170, parts included?