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My 93 Z28 had, I believe, the 4L60 in it and it was great. No problems through out the time I owned it at about 85,000 miles give or take. My sisters T/A has the 4L69E and it has had no problems and it's around 85,000 miles too. It also has the performance button on it. Much firmer shifts, it's very sporty for an auto. I like them for being an auto, they are responsive in the 4L60E (not the 4L60's) shift nice and smooth when you want it and firm when you need it. I also drove a 95 Z28 with about 140,000 miles and it had a terrible problem with the transmission slipping, had pretty burnt fluid too though. In short they are IMO excellent transmissions, but why an auto, go for the six speed, much much more fun.
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