I have a 94 Chevy Silverado with the 4L60E tranny and 200,000 miles on it. At around 80,000 miles it started to ocasionally stick in high gear when you pull up to a stop sign. It seems to do it worse when it has been out on the road for an hour or two, and more so in the hotter part of the year. The first time this happened I took it to a quick lube shop and had the whole system flushed. It still ocasionally would not down shift at stop signs. I then took it to a transmission shop where they suggested changing the shift solenoids. This seemed to solve the problem as it didn't happen again for a couple of years (20,000 miles). Then it started doing it again. I then added an after market tranny oil cooler. Seemed better but still happened ocasionally. I then had a trans shop suggest changing the pressure valve. That was a definite waste of money. It really doesn't bother me, because I just pull it down manually and it will eventually drop into low. But I am getting ready to sell it and I don't want the new owner to come back with this complaint. Any ideas?