Quote:
Originally Posted by mach18604
So 3:73's or 4:10's in a 5spd mach???????? For street use only.
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On the street, 4.10s feel great, except you may find you are doing the 1-2 shift before you get across an intersection during normal driving. That can be annoying. So 3.73s might be a good compromise for a street car, but the small difference over 3.55s is barely worth it, unless you are doing the work yourself. Neither the 3.73s nor the 4.10s will make you quicker in the 1/4 mile, because they cause a 3-4 shift before the traps. So if you are ever running a bolt-on, non-power adder car at the track, stick with 3.55s or go all the way to 4.30s.
With all that said, with a power adder, 3.90 or 3.73s are about right. I removed my 4.10s in preparation of adding a Vortech. Now that the blower is on, I see that I need a bit more gear than the stock 3.55s. The car pulls extremely hard, but you have to be going 80-100 mph to get that freight train feel. With a bit more gear, I think that will happen at more sane speeds, say in the 60-80 range. For instance, my car walks all over my buddy's '04 Cobra, but not until we get to about 80-90 mph. Until then we are fairly close from a roll (off the line I get him easily then never look back).
So the short version from my perspective:
mild bolt-ons, no track: 3.55, 3.73, 3.90, or 4.10
mild bolt-ons, no power adder, some track use: 3.55 or 4.30
cams, headers, ported heads, possible stroker, no power adder, street & track: 4.10
stock longblock + power adder: 3.90s or 4.10s
Fire suit on.