the firmed up tranny can shorten the life of some parts in the tranny. Do you know where the programmed PCM is from? They are not all the same. For example the DHP tune is known as very safe, while the ZZP PCM for the GTP's are known to have caused a blown motor or five around here. If it is from 3800 performance, how recently was it installed. They currently use the DHP program and that is what I run. But personally I don't run my GTP in the performance shift mode very often so it isnt affecting the longevity too much. What other mods do you have? pulley size? downpipe/ u bend delete/ plog? Headers? spark plugs? air intake? Also, if you have not done so, please read the safely modifying your 3800 thread that is directly above this thread in the general tech section. It will tell you what mods you are supposed to have to run the tune/smaller pulley safely.
