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How many miles can I go before the 4L30-E transmission needs over hauled?

I've got ~128,000 miles on it and I've changed the fluid every 40,000 miles. It occasionally (about twice a year) shifts hard going from 3rd to 4th gear.


A hard shift is always better than a soft one..


1999 Mitsu Montero - Crappy Weather
1992 Isuzu Pickup - Zombie Apocalypse
2008 Saturn Sky Redline - Nice Weather