Hi all, we have had a few auto VZ Holden’s of late that no matter what we do we cant get a firm and fast 1-2 shift under full load, we have done all the things we can think of like upping the line pressure removing all TM lowering the amps to 0 in the bottom 2 lines of the force motor current, drop the shift times to .1 and turn off learn trims in power mode. logged data shows throttle staying at 100%, line pressure control solenoid and 0 amps and no TM, we get a very firm and positive shift below half throttle but very very slow and soft above that, on all older model Holden’s (VT-VY) its very easy to get a good firm shift so is there a difference in the shift routines on the later model 1mb computers?
Has any one got an answer to fixing this or run into this with Holden’s?

We where looking into a new servo and maybe a few other things like replacing the accumulator spring and drilling out the valve body plate has any one had good results with these mods??