Regular Dexron III will be fine in your application. When you get your pan off, look to see if there is a dark looking "mud" covering the bottom. If so, your 3-4 clutches have probably seen better days. This is usually the first friction element to bite the dust when you feed a lot of power to a stock internal 4L60E.
Give myself or MonteC a pm if your trans service doesn't solve your problem. Both of us see each other regularly and we both know how to keep a 4L60E alive with a lot of power. I personally have a couple of my customers putting about 700 horsepower through their 4L60Es and surviving as daily drivers. It's all about good parts and attention to detail while building the unit on the bench.
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"I came into this world kicking, screaming,and covered in someone else's blood, I have no problem leaving the same way!"
ÔÇ£If you carry a gun, people will call you paranoid. ThatÔÇÖs ridiculous. If I have a gun, what in the hell do I have to be paranoid about?ÔÇØ -Clint Smith, Thunder Ranch.
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