Steve752

occurred to me it may part of a TCC partial lock strategy viz. Light, Medium, Hard still not 100% sure though & havn't verified. Not sure if the the ZF runs it, but common these days to see TCC partial lock (e.g. controlled approx 50 rpm TCC slip) - helps keep the fuel economy benefits right down at low rpm , but the slip isolates out otherwise annoying driveline booms & vibe disturbances - above certain rpm then can transition to full TCC lock etc..

Regarding those 5 ZF Converter Schedule Tables (e.g. ZF03885 Converter Schedule 2 Manual Shift Mode) I wonder if someone can help as to the meaning of the three columns for each gear, L, M & H ?