Not with a 4T60. It'* vac controlled.
If you make drastic changes (10% or more) you start to notice a difference in when the car shifts.

I need to get out of the GP mind set when I come over here..

10% depending the setup. With a high HP app, you will notice shifting issues sooner. I started noticing it at 6%, and my counterpart see'* it at 12%

Good luck finding someone with a PT for a 1997 L36 Bonneville.

Naw, you're fine. The only Series 2 Bonnies that had the 4T60-E were the '95-'97 models with the L36, and '96 models with the L67. Otherwise, the 4T65-E comments are still valid for us.

Bob - you can always do some porting on your existing TB. Nothing wrong with that!

Yep, if I do anything to this car'* TB, that'* the way I'll likely go. I just remeber how frickin open the 99 style was and I was hoping for an easier upgrade. I'm not really sure how far I want to take this car since an SSEi is hopefully in the relatively near future for me and I was thinking of something to help tide me over

Me... anyone with a 97 as car1, and open source. Not many actually got the 97 tho. I'm glad I did.