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I think I worked out gear ratios/RPM/tire size once, and on stock height tires with the std. 3.94 tranny (mtx), 7300 RPM rev limit in 5th worked out ~170 mph (@6464 RPM for ATX, assuming TC-lock, ~148mph). I'd go with speed limited by tires, though stock engine power and drag and all that good stuff may only let it hit that. I've gotten 140 before, with a stretch, and at 12psi, but it had more (stupid slow mustang), but maybe only 10mph max. I doubt at stock power level you can get 140, but ya never know.
BTW, with Neon 3.55 swap, you get 165 ATX, and 188 MTX (though something will surely break before you get that close... it's still a DSM!) />![]() 
'95 GS w/ t3/t4b FMIC, diy piping & RFL BOV MS2-Extra Fuel&Spark 50 lb/hr Holley injectors w/ 1:1 RRFPR JE 8.8:1 dish w/ Hastings Rings Eagle Rods w/ ARP bolts ARP Head studs Mild port/polish head 3" custom DP/cat section, 3" PIT catback dual MBC - 12 psi / 20psi
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