lithium398, the hard upshifts that you mentioned.... that is most likely caused by your line pressure getting out of control. Older units did have some issues with this and was addressed in several way. The cheapest way is the Trans Go Shift Improvment Kit. It will update mainly your hydraulic system, so that it can keep better control of things. No! It is not a performance shift kit and yes, it is the only one avaliable on the market for us CD4E owners and yes, I am still waiting to hear from TCI!
I have actually read, in small articles here and there, about the CD4E line pressure getting out of kilter - like yours did and causesing some very serious damage. One report of a cracked case! Most of other cases are cracked drum units.
Same goes for you though, just like Kressler. You will have to get the car scanned and see if you can turn up a code. Then we will go from there. Hopefully, in both of your cases, it is only the TSS.
Ya know? Come to think of it... My O/D light has never flashed! And I had some seriously wicked electrical issues with mine. Gosh! I really wish I could find some more info on how that darn O/D light works in conjuction with the MIL. I still see that they work together, so there should be a code for each of you, but what "actually cause it to illuminate.
