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i lost 1-2 mpg around town with my 3500 & 2.73 gears but I didnt have my tuning software at the time to adjust my lockup points lower. Also once you do lock in 4th gear on the highway its like driving with a stock TC...3.23's with a 4000 would be about as tight so i cant see much worse milage if thats what your main issue would be...and considering a stock ls1 makes peak tq between 4000-4500 it would be a very well matched combo. And yes with my 3500 stall I wish i had gone larger.
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