[tommie99]

yes this is a common thing with those trans (4L60E)ok this is what is wrong with it i think .the pmw vavle in the vavle body has lots of wear on it witch causes fuild to leak pass the vavle you can replace the valve body but 50,000 mile later you replace it again this is how we fix them remove the vavle body remove the pmw valve and spring replace the pmw spring with a heaver spring this will keep the valve from opening and stop fuild to leak pass the valve this step will not hurt anything it will give it a frimer shift....tommie99