I'm a proud chevy owner of a 4.3 v6x 97 s-10. I recently have put around a grand in to major tune-up of my truck. Now the only thing left to consider is my tranny. I have 97k and the tranny is untouched. Iwanted to do a tranny flush, but I've been hearing horror stories about getting high mileage tranny's flushed when they never had any fluid changes. My trans shifts fine, never had a problem at all with it . So my question is flush or not to flush and why?