Recently I noticed when the trans shifts from 2-3 and 3-4 anywhere above 50% throttle it seems to delay and then a second or two I get like a bang shift. Is the tranny slipping and then that bang/slam a second later the clutches finally catching or is this a vavle body/TCU issue? seems like it is getting a little worse as time goes on but kinda hard to tell.
P.S. its an 08 stage 1 with cbe and filter with 60k on it. tranny fluid changed at 35-38k.