Got a weird problem with 5-4 downshift at part throttle with there being what feels like torque converter slip then a bang when it does engage.
I am by no means a tuner but have started looking at the trans tune via a demo version of HPT and comparing other tunes with mine. I noticed that the normal, pattern a & pattern b speeds at 100% TPS do not match with the WOT speeds as they do in the majority of other files I have downloaded. Similarly with the Normal, pattern A, pattern B TCC apply release speeds and TCC WOT apply release speeds. Could this be the (or part of) the problem with this tune?
all the other shifts are ok in comparison.
Any help on this would be greatly appreciated.