Rough shift from 1st to 2nd.

clutches in tranny are probley sticking,at next or just do a fluid & filter change,add a bottle of LUCAS tranny fluid in it.should cure the problem.

Thanks for the info. This is a 1995 Riviera without supercharger. We were told at a dealer that it needed a new modulator for the problem with shifting. Any opinion on that?

i've changed the modulator before ..it helps. not too expensive and u can do it on your own. buy new rubber hoses too.

could be shift solenoids in tranny not a easy fix