Two quick questions for anyone having the "harsh shift" or know of a solution.
I have a 2001 SSEi that once warmed up shifts hard from second to third and third to OD.
I've heard that it'* caused by the PCS (Pressure Control Solenoid)
1. Is the PCS a part that can be replaced? If so, where is it and how do you get to it?
2. I've heard that installing a shift kit will resolve the problem. If so, do I need a shift kit that includes the springs or do I just need the spacers?
One more thing, I read a post on another website (Sorry, I've been unfaithful!) where a guy ran some Transtune (made by Seafoam) through his transmission and it apparently cleaned out the PCS and corrected his hard shifting problem.
Any feedback would be greatly appreciated.
Thanks,

No problem looking around, in fact, we encourage it.

OK, 2-3 and 3-4 both use a different band for the shift, so that removes that part. That leaves, high line pressure. Unless you made changes to the PCM tune, not as likely. And debris in the valve body. Running seafoam should clear that out, unless it'* really bad. You will then need to do a fluid flush and change with a new filter. That should clear up the problem. While your in there, installing a shift kits would be nice. I find it unlikely installing the kit fixes the problem. It'* far more likely changing the fluid and filter at the same time fixed it. If you want good performance with good shifts. The kit with the springs is your choice. I got mine from INTENSE-Racing.com - G8, Grand Prix, Bonneville, Regal, L67 3800 Supercharged Performance Products.

Thanks Dan,
O.K., I changed the transmission fluid and filter over the weekend. You supplied me with all of the information and pictures and stuff - thanks.
That didn't correct the problem.
Now, Should I run the seafoam stuff through it and change the fluid and filter again, or just add that stuff to the transmission fluid and see what happens?
Thanks again,
I've "talked" to you more in the last week than I've talked to my wife!
She has no real interest in my car though!

To be honest, I've never ran it threw a transmission. I know you can, I just never had to. So read the can I guess. Let me know for future reference. I don't feel like walking across the parking lot to my shop to read my can. It'* cold out. But if your going to do a shift kit, then time the seafoam to that so you get both done. The transmission oil get expensive.

Yes it does.
The seafoam product is called "TRANSTUNE". Apparently it'* a Seafoam product for automatic transmissions.
Here'* a link.
Sea Foam--Trans Tune
I'll let you know how/if it works. I'd love to be able to recommend it for all the other folks on this forum with the same problem.
Thanks man!