I own a 2003 silverado 5.3 auto and it feels like every time i shift the tranny slipps also when i go from drive to reverse it lags for a second.My truck has 82000 miles.At this point should i even bother with a tranny flush and change.Also do you guys recommend any of the lucas oil stop slip fluid.

NEver did the trans service? Do it now add the luCAS, NEXT STEP OVERHAUL.