Chris, Here is the whole story, I had a Monte Carlo 200R4 in the car for about a year and could never find the right speedometer gear combination to get the rught speedometer reading. It shifted at about 3700-4000 with a 2800 lockup converter. I decided to get the original transmission rebuilt and put in a Pat's 3000 lockup converter. I just installed the transmission 2 days ago and it was shifting at 4200 with 19 lbs boost. I stopped by the transmission shop that rebuilt the transmission last night and had them double check my installation. He went for a ride and said that this 1984 Buick transmission has all the right parts, valvebody, governor to shift at 5000 and wasn't sure why it would shift at a lower point. I have a 1984 Buick GN, but all electrical componets are changed to 1987. He called another transmission guy and they want to do a line pressure check to make sure it's up to spec. If it is, he wants to change out the valve body. My understanding is that the Buick turbo valve body is different and switching it may not be in my best interest. On the way home I changed my Caspers 8 step chip from the position 5 to 2, which is the stock chip setting for 1987 Buick GN. This lowers the boost to 10-12 lbs and changes the timing back to stock. The transmission then shifts at almost 5000. The timing of the Caspers chip also increases as it raises the boost. Thanks for your help