I didn’t know 4L60 accumulators were accessible from the bottom. I did the Home Depot shift kit to my 4T60 by shimming the accumulator springs and adding a length of steel dowel to shorten the bump stop height. I have done this with 2 GTP 4T65E HD trans and my most recent Grand Am 4T60E. The little car shifts good now. Breaks a tire loose going into second gear when it is wet. Plenty of BANG for a 3.1 car. LoL