I installed an EZ in my 2000 when it was bone stock. The transmission slipped with just an EZ and a 1500 lb boat trailer,this is with 4. 10 gears. If reliability is your main concern,get a valve body upgrade at the minumum. If you are towing at or above the factory rating of 16000 combined(3. 54) you really should have internal upgrades done,as well as an upgraded TC. Bill K can tell you how to turn the line pressure up (1-866-504-4002)a few turns,if you are broke,but this isnt the cure,its a band -aid,bu it works.