TH350 and the 1/4 mile

[Irishpilot]

Hey all, before the summer ended, I got my truck pieced back together and took it to the drag strip in Utah. I having a hell of a time with the tranny shifts, as the TH350 was shifting at 4,200 rpm, where I wanted it shifting at 6,000 as the engine I built can handle the revs. As is at 4,000' elev, it ran 15.0 @95mph, but I know she's got a lot more in her.

I adjusted the vacuum port screw on the tranny, but it only increased the shifts by 200 rpms. Besides holding the transmission in gears manually (which I really don't want to do), what can I do? I've heard that tranny shops can adjust the valves and weights internally to get the shifts. Has anyone done this, and if so how are the street manners? Thanks!

[hugger6933]

Get a govenor kit. It contains different springs and flyweights so that you can taylor the upshift RPM's. More than likely you need some tighter spring in that gov. You can change it will very little effort and it does not require you to pull the trans or the pan. If you do pull the trans it might be a good time to install a shift improver kit and a converter that has a higher stall rate. Jim

[Irishpilot]

Thanks for the input. I've got a 3000 stall in it now, which is working well for launching the truck and I'm not getting any bog after the launch. I'll look into that kit.