So I had a really interesting day. Trying to install a shift kit on my newly acquired 1997 Bonneville. Well I thought I had a 4T65E as it seems to say everywhere. Got a shift kit for it, like I have installed in my other 2 GM cars of the same age range. Everything underneath seemed to look the same, accumulator looked the same. Well, I take it apart and swapped the springs as I did on my other cars. I go to install the spacers that come with it that go on the piston stem and they don't fit. Kind of dumbfounded because I did do this with no issue on the other cars, same kit. I installed the springs and left out to spacers figuring I would get back to it when I get it figured out. Now after doing some research, it seems the car may have a 4T60E, not that it seems to belong there but it is. Build date is late 96 but it is a 97 model. Anyone with any experience with these trannys know if it is safe to continue with the firmer springs? Not sure what to do at this point aside from taking it apart and putting the old stuff back. Would be a huge waste of expensive fluid. I will say it does shift much better than it did, just don't want to kill it if the firmer springs will hurt anything internally. Haven't taken it out too far to see if it softens up after it gets very hot. The battery was disconnected to allow for clearing the shift firmness memory. Thanks in advance for any info. I am sure many of you have had these apart at some point.