On an older GM engine...a 1998 V6 3800 I been reading that it is common for the PCS to go bad which causes the transmission to hard shift. I only notice this when going from 1st into 2nd gear and I wouldnt describe it as a hard shif per say...but I feel a faint thump as it changes. My question is, is this hurting anything to not replace the PCS if this is the cause of this symptom? Is it causing damage to the transmission?