Obviously, replacing the PCS solenoid is the correct way to remedy the issue but the costs involved are very high. Cooling the fluid down for the way high temperature it runs from the factory and speeding up the shifts with the shift kit will cure the problem if your tranny does not have any other issues-it is NOT a bandaid on the problem. What you are doing is replacing electronic control of the pump pressure and replacing it with mechanical control like in the old days before electronic everything. Since very high tranny fluid temperature effects a bad PCS solenoid, lower the fluid temperature helps that PCS isssue as well and just as important will do wonders for extending the life of these tranny's. I should have put a cooler on the 4T65E years ago but figured GM would know after 40 years of running tranny cooler that transimission fluid should be kept as cool as possible for proper operation, not as hot as possible for proper operation-wrong!
