gear ratios 1 for tim

ive just bought an uprated chrysler gearbox (for my avenger track car before you all get excited) and its got the following ratios in it.
1st - 2.67
2nd - 1.63
3rd - 1.28
4th - 1.1

this is a proper competitions spec box but what do the gear ratios mean in english in terms of mph?
 
mph???
Depends what ratio your axle is,what size wheels your running and what power and torque your lump has;)The gearing also affects the engine rpm at top speed you dont want it reving its nuts off to early through the gears as the power drops off.
What is the power band range of the cam your running? eg 3000-6000rpm

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Here you go rich read this

http://www.engineerstudent.co.uk/understanding_gears.html

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