Enrique get 4:10's! You won't regret it and if you're cowoker has the same mods as you without gears you should easily beat him by 2 cars or more with the 4:10s.
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92 AOD GT, K&N, ram air, pulleys, 2 ch. flowmasters, 4:10's, shift kit, 1 5/8 mac longtubes and offroad hpipe 14.249 @ 97.34 mph before the headers and hpipe