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You'll have to weigh a lot of factors to make the best decision for your driving environment and your preferences. I keep my cars for a LONG time and do my own repairs (once the warranty runs out) and my own mods.
My experiences (and those of my family and friends) indicate that most automatic transmissions will require a rebuild or replacement between 100K and 150K miles. Be sure to factor in those costs IF you keep your cars long term.
At 108K, my Impala SS (K&N Cold Air was the only mod) shattered it's planetary gearset despite servicing the transmission every 20K vs the book at 100K. I shopped around and the most economical alternative was to buy a new transmission from the Chevy dealer and install it myself. I paid ~$1750 for the parts and did the work myself.
I'd have gotten more enjoyment from spending that money on Eibach springs, Konis, and Hotchkiss swaybars. YMMV. As for me, that's my last automatic as long as God grants me the health to change my own gears.
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