I never considered change the final drive with the ATX. Not sure if it can be done. There are probably variations over the years. Not sure what is interchangable. Sometimes I miss my Caprice. with a 4 spd it could do 90mph where the Subaru is doing 65. :cry: Of course the Caprice got 18-19 summer and 17-18 winter lol The LT1 block with the interceptor package has very little variation in its FE. It just went how ever fast you wanted it to go. I think my worse tank was something around sub 17, maybe 16.5ish. And that was an entire 21 gallon tank of nothing but short trip driving around the holidays. The car never fully warmed up!
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