Harsh 2-3 shift on VZ auto

[vinnycol]

People
I've read people having issues with the 4spd auto as fitted to the VZ, but what i'm experiencing is a harsh shift from 2-3 (with a clunk) ok all other shifts. funny thing is 2-3 is smooth a silk if i keep the selector in 3rd instead of drive... go back to D and the 2-3 shift again becomes harsh... Wife has a VZ with exactly the same behavior...

Any of you guru's out there have any idea if the cause would be electronic or mechanical??? (apparently have the latest trans firmware in the comp.)
cheers
Vin

[murph_1989]

mine clunks a bit when i redline second overtaking on the highway