Plan on installing a Transgo 1-2 Shift kit in my 1968 Wildcat. Any one out there already do this in a "big" Buick car and what size did you drill out the 2nd feed hole and 3rd feed hole? My car has a stock converter, stock turbo 400,non-posi 3.08 gears. I'be been searching all over this forum and others and have been getting all kind of suggestions but I have yet to find info on another buick "big"car..mainly chevelles/corvettes/etc..I would think that the weight of the car would affect shifting as well.
As suggested in the TG install sheet you should stay on the conservative side to start with and you can always drill it out if you don't like the results. They include extra gaskets in the kit so you can do this fairly easily. It's helpful to have a oil pan with drain plug.
That's what I've been reading but there has to be some more specific info,as this mod has been done for over 30 years .I'd like to get it good on the first try. I'm looking for "driveability" with firm but not tire chirping shifts when cruising around but I want to feel it and chirp a when I get on the pedal hard (wot).I was thinking of drilling the 2nd hole to .125,the 3rd to .140 and leave the accumulative feed hole alone hoping to achieve this.
I would go with range #2 - Between 0.082 - 0.093 at hole A - second feed hole. Leave the others alone. That should give you a firm shift when you need it and softer shift at light throttle.
Give TransGo a call. I called all the other big names when I was looking for a shift kit and got people who didn't even know what a switch-pitch was. At TransGo I got some gruff old guy who really knew what he was talking about. I know you don't have a switch-pitch, but my point is that I got good service there.
