you could well have 3.08s in it stock (mine did) when im goin 80km/h in 5th with my 26.1"tire (235/60/15), i am at like 1400rpms or close to that.
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1988 Mustang GT, T-5
3.08's, No Smog Pump (Shorty Belt), Dumps At The End Of Stock H-Pipe, K&N Air Filter (Stock Air Box), Removed Air Silencer
My Stang
My Site (Not Done Yet)