[57chevyragtop]

I agree with GM trannyman, Excellent post! I've talked with many Trans tech over the years and 99% say that the flushing can cause problems by stirring up particles that have settled. Changing the filter and the four or five quarts is just fine if done regualarly 50-60K depending on driving habits, more often if you pull heavy loads or live in mountain regions. The High detergent content of the 4-5 qts is sufficient to replace any breakdown in remaining oil composition. I have done this for 40 yrs and never had a tranny problem.