[StevePT]

Okay, I guess I should have clarified a bit more. If it's a "harsh" shift that feels like the tranny has a shift kit than it's not that much of an issue.

If it's a harsh shift that feels like going from neutral to reverse while ever so slightly rolling down a hill then yeah that's not too great on the drivetrain.

Firm shifts are just that many less milliseconds the clutches are slipping. As long as it's not excessive the drivetrain will be OK.

Based on how our 99 Regal GS is shifting from 2-3 and sometimes 3-4 in hot weather it's firm, but not enough to cause drivetrain damage.