Having 2-3 shift overlap - Thinking of switching from 4.2 apply lever to 3.8 - Any Other Thoughts?

Kim, I think you’re talking more about the 1-2 overlap. The OP is talking strictly 2-3 overlap. The LBA valve body can create a little bit of 1-2 overlap, which is where the dual spring servo, and second gear lever ratio can help take care some 1-2 overlap. But the LBA valve body has no bearing on 2-3. The low band is already fully released by the time the transmission is shifted from 2nd to 3rd. The 2-3 overlap is solely the release of second gear band while the high gear clutch is being applied. Not telling you anything you don’t know. But I think there’s some confusion. That’s where we both agree with the dual spring servo, less ratio lever, and high gear clutch clearance, with spring count, all matter for that 2-3 overlap.
Ya, I don’t know what I was thinking. Thanks for the correction